Let f(x)=sin 3 x f(-x)=sin 3 (-x)=-sin 3 x Hence, f(x) is an odd function. Since, if f(x) is an odd function. Therefore, I=0.

Evaluate

Let

f(x)=sin³x

f(-x)=sin³(-x)=-sin³x

Hence, f(x) is an odd function.

Since, if f(x) is an odd function.

Therefore, I=0.