please need help in exercise 25 not 23 to 24 , need please in specifical exercise 25

Theorem 5 Iff (2) is regular in the region R encompassed by the closed curve C, and if zo is any point in the interior of R, then (16) where for) (20) is the nth derivative of f (2) evaluated at 2 = 20." Exercise 23 Use Theorem 5 to evaluate sinha where C is the unit circle centered at the origin. Exercise 24 Prove Theorem 5 for n = 1. Exercise 25 Use mathematical induction to prove Theorem S for n > 1