Cos4x = 8 cos^4 x - 8 cos^2 x + 1Please help me prove! :D

1 answer:

3 0

From cos(2x) = 2cos^2(x) -1

cos(4x) = 2[cos(2x)]^2 -1
= 2[2cos(x) -1]^2 -1
= 2[4cos^2(x) - 4cos(x) + 1] -1
= 8cos^2(x) - 8cos(x) + 1

You might be interested in

Choose the function whose graph is given below.

torisob [31]

Answer:

A y=tanx

Step-by-step explanation:

mark me brainliest pl

7 0

2 years ago

A water tank is 5m tall and has a diameter of 3,5m. Calculate the capacity (volume) of the tank. Use pi=3,14

aleksandr82 [10.1K]

Answer:

Step-by-step explanation:

<h2>minions </h2>

5 0

2 years ago

A shoe store recorded the price (in dollars) of 175 pairs of women's shoes and 175 pairs of men's shoes. The data collected was

arsen [322]

Answer:

Most of the men's shoes in the data set cost more than women's shoes.

Step-by-step explanation:

From what I could tell it can't be The price of men's shoes has a higher interquartile range than that of women's shoes. becuse that's false what looks to fit is Most of the men's shoes in the data set cost more than women's shoes. since on the graph more of the mens vaules are bigger

5 0

3 years ago

What is the cumulative area from the left under the curve for a z-score of -0.875? What is the area on the right of that z-score

Blizzard [7]

Answer:which z sqore are u talking about

Step-by-step explanation:

4 0

2 years ago

Type the equation for the graphbelow.Pi/3 2piy = [?] sin([ ]x)

Pie

To find the equation of the graph, what we do is to recognize some characteristics of a sine function:

- Amplitude: The amplitude of the sine function is the distance from the middle value or line running through the graph up to the highest point. In this case, the amplitude is 1.

- Period: The period of a sine function is defined as the length of one complete sine wave or one complete cycle of the curve. It can be found using the equation: P=2pi/B.

Why are these characteristics important?

Because the sine function has the following general form:

In this problem, we have A=1 and we know that the period equals 2pi/3. So,

Therefore, the equation of the graph is:

8 0

1 year ago