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blsea [12.9K]
2 years ago
11

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

Mathematics
1 answer:
sesenic [268]2 years ago
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
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Rebecca has 8 basketball cards. This is 1/5 the amount that Eden has. How many basketball cards does Eden have?
Margarita [4]

Answer:

Eden has 40 basketball cards

Step-by-step explanation:

Just do 5*8 which equals to 40, you can go back and check your answer by finding the 1/5 of 40 and you would receive 8

7 0
3 years ago
the perimeter of a triangle is 12cm. which one of the following is not possible sides of a trianglr? a)1 b)5 c)6 d)none of thish
Phantasy [73]

Perimeter of triangle = 3(side)

P = 3(s)

12 = 3s

12/3 = s

4 = s

I think there is a typo in your post.

The question should be: WHICH ONE OF THE FOLLOWING IS A POSSIBLE SIDE OF THE TRIANGLE?

In that case, 4 cm is the answer. However, 4 cm is not listed among the choices. So, choice d is the answer.

7 0
3 years ago
3x^2 + 64 = 2x^2/2 find the roots of the quadratic equation
Reil [10]

Answer:

4√2i , -4√2i.

Step-by-step explanation:

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2x^2 = -64

x^2 = -32

x = +/- √-32

x = +/- √16* -2

x = +/- 4√2 i.

8 0
3 years ago
If the diameter of a disc is 50 ft, what will be the area of the disc?
olga55 [171]

Hey there! Your answer is:

1,963

Step-by-step explanation:

Please mark Brainliest<3

7 0
3 years ago
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