Question

cos^6 x

Answer 1

cos^2 x equals 1-sin^2x

Answer 2

cos^6 x equals (cos^2 x)^3

Answer 3

So it equals ( 1-sin^2 x)^3

Answer 4

oh from there what would it be? because when i foil it out it I get stuck somewhere in the middle and my answer is always partly off from what it should be

Answer 5

What should it be?

Answer 6

You're going to have to foil it out

Answer 7

Srry

Answer 8

the book doesn't say on this one but for the previous questions like cos^4 x sin ^4 x im supposed to get 1/32(3/4 -cos4x+1/4cos8x) and I don't.. awk

Answer 9

You should get -sin^6(x)+3 sin^4(x)-3 sin^2(x)+1

Answer 10

oh in cos still tho

Answer 11

We'll I think this is the answer

Answer 12

Oh ok

Answer 13

I think this is it then:
1/32 (15 cos(2 x)+6 cos(4 x)+cos(6 x)+10)

Answer 14

ok ill try foiling again thanks :)

Answer 15

I just converted everything back to cos using all the trig laws and stuff

Answer 16

The answer is 1/32 (15 cos(2 x)+6 cos(4 x)+cos(6 x)+10)

Answer 17

Geenggen!