Question

Verify the identity.

sin 4x = 2 sin 2x cos 2x

Answer 1

sin(4x) = sin( 2x + 2x)

Recall that

sin( A +B) = sin(A)cos(B) + cos(A)sin(B)

so it is

= sin2xcos2x + sin2xcos2x

Answer 2

can you figure out the rest?

Answer 3

What else do i do?

Answer 4

what else is there to do other than add it ?

Answer 5

I dont know!! haha

Answer 6

haha well did I verify it ..now your done!

Answer 7

thank you so extremely much. :)

Answer 8

yw =))

Answer 9

U can use the identity sin2y=2sinycosy!!
and take sin4x=sin2(2x) where take 2x as y and prove it!!