Let f(x)=∫x3πcos(t)dtf(x) = \int_{x^3}^{\pi} \cos(\sqrt{t}) dtf(x)=∫x3πcos(t)dt. Find f′(1)f'(1)f′(1).
−3cos(1)-3\cos(1)−3cos(1)
3cos(1)3\cos(1)3cos(1)
−1-1−1
cos(1)\cos(1)cos(1)