Question

simplify: 4-8(sin^2 6x)
please show steps!! thank you!

Answer 1

\[4-8 (\sin^2 6x)\]
Hi @lin.ivory Do you know the formula of sin 3x?

Answer 2

i know "sin2x" but ive never heard of sin3x

Answer 3

Ok do you have options? Cause it can be simplified in several ways

Answer 4

a. cos12x
b. 2cos6
c. 4cos6x
d. 4cos12x
the answer is D, but i dont know how to get there! =(

Answer 5

Ok got it:D
You know what's cos 2x?

Answer 6

OHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!! so do i factor out the 4 and get
4(cos2(6x)) and then just multiply to get 4(cos12x)??!!! AWESOMENESS!! THANK YOU!!

Answer 7

\[\mathbb{You're\ welcome:)}\]
\[ \huge \mathbb{And\ Welcome\ To\ Open\ Study}\]