(sin2a+sin4a)²+(cos2a+cos4a)²=4cos²a

Answers

Answer 1
Expanding this out gives:
[tex](sin^2 (2a) + 2sin(2a) sin(4a) +sin^2 (4a)) \\ +(cos^2 (2a) + 2cos(2a) cos(4a) +cos^2 (4a)) \\ = 4cos^2 (a)[/tex]

Simplify by using pythagorean identity:
sin^2 + cos^2 = 1
[tex]2sin(2a)sin(4a) + 2cos(2a)cos(4a) + 2 = 4cos^2 (a)[/tex]

Next use cosine difference identity:
cos(x-y) = cos(x)cos(y) +sin(x)sin(y)
[tex]2 cos(4a-2a) +2 = 4cos^2 (a)[/tex]

Next use cosine double angle identity:
cos(2x) = 2cos^2 - 1
[tex]2(2cos^2 (a) -1) + 2 = 4cos^2 (a)[/tex]

Finally distribute and Right side  = Left side
[tex]4 cos^2 (a) = 4 cos^2 (a)[/tex]
Identity is proved

Related Questions

The scale on Krystal's map is 1 inch = 18 miles. How far apart are Greenville from north valley?

Answers

According to Krystal's map scale, the distance between Greenville and North Valley is 72 miles.

To find the distance between Greenville and North Valley using Krystal's map scale of 1 inch = 18 miles, you need to determine the distance represented by the two locations on the map and then convert it to real-world miles.

First, measure the distance between Greenville and North Valley on the map. Let's say it's 4 inches.

Now, multiply the measured distance on the map by the scale factor:

4 inches * 18 miles/inch = 72 miles.

Thus, according to Krystal's map scale, the distance between Greenville and North Valley is 72 miles.

This means that in reality, Greenville and North Valley are 72 miles apart.

This calculation is based on the given scale and assumes that the map accurately represents the geographical locations of Greenville and North Valley.

Always consider real-world conditions and factors like road layouts when planning actual travel.

Write the mixed number as a fraction 4 1/3, 1 2/5, 3 2/3

Answers

to get they total number of the fraction, you first times the bottom,  by the number one the side of the mixed number, and then add the top number to the answer. so for the first one, 3*4 = 12 + 1 = 13 so the answer is 13/3, for the next one, 5*1 = 5 + 2 = 7, so the answer is 7/5, and for the last one, 3*3 = 9 + 2 = 11, so the answer is 11/3                                                                                      so if your to lazy to read this the answers are                                                        1. 13/3                                                                                                                2. 7/5                                                                                                                  3. 11/3

combine like terms 3m-6+m^2-5m+1

Answers

m^2-2m-5 IS THE ANSWER :D
3m-6+m^2-5m+1
-2m-6+m^2+1
-2m-5+m^2

Assume that advanced students average 93% on an achievement test and regular students averaged 75%. If 100 advanced students and 300 regular students took the test, what would you expect the average to be? How many of each kind of student would be needed to get a group of 90 students who average 87% on the test? Please include work/explaination, I along with a few of my classmates are confused by this problem. We are in a chapter about systems of equations.

Answers

Average (mean) = (sum of all the data) / (# of data)

sum of all the data = (average)(# of data)

Thus for 100 students with an average of 93,
sum of all data = (93)(100) = 9300

and for 300 students with an average of 75,
sum of all data = (75)(300) = 22500

Therefore you would expect the overall average to be
(9300 + 22500) / (100 + 300) = 79.5 %

Now if there are x # of advanced students and y # of regular students, then

x + y = 90 (total # of students) and 93x + 75y = 87(x + y) (overall average)

The second equation can be simplified to x - 2y = 0

Subtracting the two equations yields

x = 60 and y = 90

Therefore you would need 60 advanced and 30 regular students.

What is the answer to 5 + 1 x 10=

Answers

5+1x10=15
5+(1x10)=15

Answer: The simplified answer is 15.

Explanation:

Since we have given that

[tex]5+1\times 10[/tex]

As we know about the BODMAS rule,

Where B stands for brackets

D stands for division

M stands fro Multiplication

A stands for addition

S stands for subtraction

So, in this expression, we first use the multiplication operation and then addition as shown below:

[tex]=5+1\times 10\\\\=5+10\\\\=15[/tex]

Hence , the simplified answer is 15.

A function is represented by the graph. A function is represented by the graph.

Complete the statement by selecting from the drop-down menu.

The y-intercept of the function y = 2x + 1 is greater than, less than, or equal to the y intercept of the function represented in the graph.

A) Greater than

B) Less than

C) Equal to


Answers

Answer:

I took the test and they got it right, "equal to" is the correct answer.



The y-intercept of the function y = 2x + 1 is equal to the y-intercept of the function represented in the graph.

From the given graph: the y-intercept is = 1.

To find the y-intercept of y=2x+1 we compare it with y=mx+b.

So, b=y-intercept=1.

Both y-intercepts are 1.

It means the y-intercept of the function y = 2x + 1 is equal to the y-intercept of the function represented in the graph.

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need help 4 1/5,-0.22,-1.4,1.4

Answers

g wbjsejrjrjguriirriririeieieirjriejer
Final answer:

The given numbers include both decimal and fraction values, specifically -0.22, -1.4, 1.4, and 1/5 (equivalent to 0.2).

Explanation:

The given numbers are 1/5, -0.22, -1.4, and 1.4. These numbers represent a set of decimal and fraction values.

Decimal Numbers: -0.22, -1.4, and 1.4

Fraction Number: 1/5 (which is equivalent to 0.2)

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how to convert 3,090 grams to kilograms

Answers

There are 1,000 grams in a kilogram. 
3090/1000=3.09
So, there are 3.09 kilograms in 3090 grams.
The answer is 3.09 kilograms

What numbers have an absolute value of 9

Answers

-9 and 9 because of you look on a number line -9 and 9 are 9 numbers away from 0.

The numbers that have an absolute value of 9 are 9 and -9.

In general, the absolute value of a positive number x is |x| = x, and the absolute value of a negative number -x is |x| = -(-x) = x.

So, for any number x or -x where x ≠ 0, its absolute value is always positive and equal to the positive value of "x."

The absolute value of a number is the distance of that number from zero on the number line.

Since both 9 and -9 are 9 units away from zero, their absolute values are both 9.

Hence, the numbers are 9 and -9.

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Can someone please help me with question #3 plzz

Answers

(4.55 x 10^13)-(1.78 x 10^12)=4.372 x 10^13


     45500000000000
  -    1780000000000
-----------------------------
     43720000000000 or 4.372 x 10^13
Answer is 4.372x10^13 or 43,720,000,000,000 hope this helps

Quincy is using 320 pieces of stone tile to make red white and blue mosaic. If 20% of the pieces are blue and 35% are white how many pieces are red?

Answers

100% = 320
20% = Blue tiles
35% = White Tiles
100% - 55% = Red Tiles = 45%
45% of 320
320 x 0.45 = 144 Red tiles
Final answer:

To determine the number of red tiles in Quincy's mosaic project, the percentage of blue and white tiles were converted to actual numbers and subtracted from the total. This calculation revealed that there are 144 red tiles.

Explanation:

Quincy is using 320 pieces of stone tile to make a mosaic.

It is given that 20% of the pieces are blue, and 35% are white. To find out how many tiles are red, we start by calculating the number of blue and white tiles:

Blue tiles: 20% of 320 = (20/100) * 320 = 64 tilesWhite tiles: 35% of 320 = (35/100) * 320 = 112 tiles

Adding the blue and white tiles together gives us 64 + 112 = 176 tiles.

Since the total number of tiles is 320, the number of red tiles will be the remaining tiles after subtracting the blue and white tiles:

Red tiles = Total tiles - (Blue tiles + White tiles) = 320 - 176 = 144 red tiles.

Therefore, 144 pieces of stone tile are red in Quincy's mosaic project.

Answer for a,b,and c PLEASE!!!

Answers

A: Yes
B: .5, 1, 1.5
C: d=t/ 6 2/3 - or somthing like that
a. not proportional
b. 1. is 6.66  2. is 20 3.is 60
c. you can't because the equasion is not proportional

Gas mileage is the number of miles you can drive on one gallon of gas. A test of a Nissan car results in 450 miles on 10 gallons of gas.

A. What is the car's gas mileage?

B. How far could you drive with 60 gallons of gas?

Answers

A. 45 miles per gallon of gas
B. 2700 miles

The unit rate for $920 for 40 hours

Answers

All that needs to be done for this question is:

920 divided by 40

once the problem has been solved the answer comes out to be:

23 dollars an hour

if you have any questions feel free to ask me ;)

Answer:

$23

Step-by-step explanation:

i did the thingy

On Saturday afternoon, 350 people attended a play. The seating was arranged in 7 equal rows. How many people sat in each row? Draw a bar diagram. Write and solve an equation.

Answers

350/7=50 So your answer is 50 
You have to divide 350/7 which equals to 50. 50 people sat in each row

what strategy can I use to solve 6x7 and 3x9?

Answers

Well, there are many strategies you can use to solve those problems. You can either use:

1. A Multiplication table
2. A number line
Or
3. Break it down

Example: 8 * 12

What I can do to "break it down" is I can substitute '12' as '10 + 2' and then simply multiply.

(8 * 10) + (8 * 2) = 80 + 16

80 + 16 = 96

So, in this case, 8 * 12 = 96; does this make sense?
You could use multiplication charts and arrays.(there are more)

A 16-pound turkey cost $13.60. What was the cost per pound?

Answers

85cents per pound :) do 13.60 ÷ 16 = 0.85
.85 cents per pound.  I divided the price by the weight.

What is 15% of 15% of 15% of 500 how does this compare to finding 45% of 500

Answers

"500* (15/100)* (15/100)* (15/100)= 1.6875

500* (45/100)= 225

Therefore, the process of finding 45% of 500 does not have anything to do with the process of finding 15% of 155 of 15% of 500~"
15% of 500 is 75, 15% of 75 is 11.25, 15% of 11.25 is 1.6875, an 45% of 500 is 225. Does that help?

Lexie started her homework at 4:30 p.m. to finish at 5:05 p.m. how many seconds did it take her to finish her homework

Answers

35 seconds is how long it took for lexie to do her homework

It took 35 minutes to do her homework so when you convert that it took her 2100 seconds to do her homework

the number between 33.01 is added to the list so that the new list is still in numerical order between which two numbers should 33.1 be placed










Answers

three three. zero one

A number is written with the following factorization: 2^2 X 3 X 5^4 X 8 X 11^2. Is this factorization a prime factorization? Explain why or why not. If it is not correct, give the correct prime factorization of the number.

Answers

Considering the definition of prime number, prime factorization and a property of the potentiation, this factorization is not a prime factorization. The prime factorization is expressed as: 2⁵× 3× 5⁴× 11²

In the first place, a prime number is a natural number greater than 1 that has only two different divisors: itself and 1. That is, a prime number is an integer greater than 1 that is only divided exactly by 1 and itself .

On the other side, the "factors" are the numbers that you multiply together to get another number.

So "factoring into primes" is figuring out what prime numbers you have to multiply together to get the original number.

That is, factoring in prime numbers is writing any number as the multiplication of prime numbers, regardless of the order of the factors.

In this case, you have the factorization: 2²× 3× 5⁴× 8× 11²

This factorization is not a prime factorization. 2,3,5 and 11 are prime numbers, but 8 is not a prime number. This last number can be factored as:

8= 2³

Then, the factorization is expressed as: 2²× 3× 5⁴× 2³× 11²

A property of the potentiation expresses that the product of powers of equal base results in the same base raised to the sum of the exponents of each factor. In this case, 2² and 2³ are two powers with the same base, so the power is expressed as:

2²× 2³= 2²⁺³= 2⁵

Finally, the prime factorization is expressed as: 2⁵× 3× 5⁴× 11²

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Final answer:

The given number is not in prime factorization due to the presence of '8'. The correct prime factorization is '2^5 X 3 X 5^4 X 11^2'.

Explanation:

The number given in the question is not expressed in its prime factorization due to the presence of '8' which is composite number and can be broken down further. In fact, the number '8' can be represented as '2^3'. So, if we modify this in the original expression, it would change to 2^2 X 3 X 5^4 X 2^3 X 11^2. Simplifying this, we get 2^5 X 3 X 5^4 X 11^2, which is the correct prime factorization. A prime factorization only includes prime numbers, which are numbers that have exactly two distinct positive divisors: 1 and the number itself.

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A shipment of 8 tons of sugar is separated into containers of equal size. If the shipment fills 3 1/3 containers, how much sugar can one container hold. You don't have to give me the answer jus explain it please. Thanks!!!

Answers

take 8 and divide it by 3 1/3. to make it easer 1/3 could be .3 as a decimal.
so 8 divided by 3.3.
8/3.3= 2.42
so it would be 2.42 tons of sugar per container. 

The quantity of sugar one can hold is 2.4 tons.

What is the unitary method?

The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.

Given that, a shipment of 8 tons of sugar is separated into containers of equal size.

The shipment fills [tex]3\frac{1}{3}[/tex]= 10/3 containers

Quantity of sugar one can hold is

8 ÷ 10/3

= 8× 3/10

= 24/10

= 2.4 tons

Therefore, the quantity of sugar one can hold is 2.4 tons.

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Explain the meaning of (2,40).

Answers

Well basically, (2,40) are coordinate points where 2 represents x and 40 represents y.

Coordinate points - (x,y)
They are used to locate a point on a coordinate plane, or graph.

The correct answer for the meaning of (2,40) is they represents the coordinates of a point on x-y plane.

What are Co-ordinates?

Coordinates are sets of values used to represent the position or location of a point in a given space.

The number of values in a coordinate set depends on the dimensionality of the space being considered.

In two-dimensional space (2D), coordinates typically consist of two values, often denoted as (x, y).

Given points:

(2,40)

X-coordinate = 2

y-coordinate =40

The correct answer is (2,40) represents X and Y coordinate on a 2D plane.

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Express 750g as a percentage of 1.5kg.

Answers

750 is 50% of 1.5kg and you find it by dividing 750 by 1.5kg

The correct answer for [tex]750[/tex]g as percentage of [tex]1.5[/tex]kg is  ,[tex]750[/tex]g is [tex]50[/tex]% of  [tex]1.5\\[/tex]kg.

To express 750g as a percentage of 1.5kg, convert both quantities to the same unit of measurement.

Since both grams (g) and kilograms (kg) are units of mass,

convert 1.5kg to grams:

[tex]1[/tex] kg = [tex]1000[/tex] g

=[tex]1.5*1000[/tex]

= [tex]1500[/tex] g

To express [tex]750[/tex]g as a percentage of [tex]1500[/tex]g,

Percentage = (Part / Whole) * 100

Percentage = [tex]\dfrac{750}{1500}*100[/tex]

Percentage =  [tex]0.5*100[/tex]

Percentage =  [tex]50[/tex]%

The correct answer is [tex]750[/tex]g is [tex]50[/tex]% of [tex]1.5[/tex]kg.

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Gee prepared 12 kilograms of dough after working 3 hours. How much dough did mr.g prepare if he worked for 20 hours? Solve using units rates

Answers

kilograms/hours 12/3=x/20 3x=240 x=80 kilograms 
Hope this helps!
Is you divide 12 by 3= 4kg (per hour) then do 4 times 20 :)

Deanna,Amy, and Pam pick the same number of peaches at an orchard. They each set their peaches in four equal piles with6 peaches in each pile. Write a multiplication that shows how many peaches they picked

Answers

6·4=24 

if they want you to find out how many peaches all of them picked together, its 24·3


6 x 4 would be an great answer for this question if you have to write an equation

For any nonzero real number a, the __________ of a is 1 over 8 .

integer

whole number

multiplicative inverse

absolute value

Answers

integer because it is an integer

multiplicative inverse

which three of the following are correct

1/5 < 1/4
2/3= 5/9
1/3 = 2/6
3/4> 6/10
2/3 > 4/5

Answers

Get common denominators on the fractions in each expression

The first = true
The second = false
The third = true
The fourth = true
The fifth = false

Therefore, 1. 3. 4. are all true. 

What is the mode? I can only pick one answer, but there are 3 answers that have a number that occurs the most. PLEASE explain how you got your answer. Look at the picture to answer my question. Thanks!

Answers

Mode is the number that appears most in a set of numbers
 Example: in {6, 3, 9, 6, 6, 5, 9, 3} the Mode is 6
I think the one you have highlighted is correct 
nvm it is a your correct you forgot to highlight the two 30s

write the missing exponent. 1/169 = (1/13)

Answers

Answer is 2 because 13 times 13 is 169

Answer:

[tex]\frac{1^2}{13^2}=(\frac{1}{13})^{2}[/tex]

Step-by-step explanation:

We have been given an equation [tex]\frac{1}{169}=(\frac{1}{13})^{*}[/tex]. We are asked to write the missing exponent for our given equation.

We can see that 169 is square of 13, so we can write left side of our equation as:

[tex]\frac{1}{13^2}=(\frac{1}{13})^{*}[/tex]

We can raise 1 to any power and answer will be same.

Raising 1 to 2nd power, we will get:

[tex]\frac{1^2}{13^2}=(\frac{1}{13})^{*}[/tex]

Since both numerator and denominator is raised to 2nd power, so we can raise [tex](\frac{1}{13})[/tex] to 2nd power as:

[tex]\frac{1^2}{13^2}=(\frac{1}{13})^{2}[/tex]

Therefore, our missing exponent is 2.

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