Question

prove that sin 3x is equal to 3 sin x - 4 sin 3x ​

Answer 1

sin 3x = 3 sinx - 4 sin^ 3 x

L.H.S = sin 3x ......( by formula of sin3 theta = 3sin theta - 4 sin ^3 theta

=3 sinx - 4sin^3x