se 7.5.6 continuous formula 6 Integration-by-parts). (a) Assume h(x) and k(x) have ivatives on la, b) and derive the familiar integration-by-parts ht)k (t)dt h(b)k(b) h(a)k(a)-h')k()dt Explain how the result in Exercise 7.46 can be used to slightly weaken Dthe hypothesis in part (a).