Question

A= int 0 ^ pi/2 cos 3x* dot d x s n B= int 0 ^ pi/2 sin 4(x) dx, then find (AB) .​

Answer 1

• intsin4xcos3xdx = 12 int2sin4xcos3xdx = 12 int (sin7x+sinx)dx using 2sinAcosB = sin (A + B ) + sin (A - B ) = 12 + c = - 114cos7x ...