I need help with question 43 for a and b.

Find the derivatives in Exercises 39-44. a. by evaluating the integral and differentiating the result. b. by differentiating the integral directly. Vx sin x d d 39. cos t dt 40. 312 dt ax Jo dx tan 0 d 41. Vudu 42. d sec2 y dy dt Jo 7-3 d 3 43 erdt 44. 7-4 + dx dx Jo 2 1 * 2