Question

Verify the identity [(4sin theta*cos theta)*(1-2sin^2 theta)=sin(4 theta)

Answer 1

\[4\sin\theta\cos\theta(1-2\sin^2\theta)=\sin(4\theta)\]right?

Answer 2

Yes, that's right.

Answer 3

this will undoubtedly help http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

Answer 4

Okay. Thank you.

Answer 5

look at the double angle formulas. applying two of them to the left side will prove the statement

Answer 6

Okay, thank you for helping me.