Question

how sin 2 theta is equal to 2sin theta cos theta​

Answer 1

Question:

=> Prove that sin 2Ф = 2 sinФ cosФ

Solution:

We know:

=> sin(A + B) = sinA cos B + cosA sinB

Using it we get:

=> sinФ cosФ + cosФ sinФ

=> 2(sinФ.cosФ)

=> 2 sinФ cosФ

Hence, L.H.S = R.H.S.