Let f(x)=7sin(x+Pi)+cos2x

Question

help finding f'(x), f"(x) and f^4(x)?

Answer 1

The trigonometric function is f(x) = 7 sin(x + π) + cos(2x).

We know that sin(π + x) = - sin(x).

f(x) = - 7 sin(x) + cos(2x)

Apply first derivative with respect to ' x '.

Apply second derivative with respect to ' x '.

Apply third derivative with respect to ' x '.

Apply fourth derivative with respect to ' x '.