Finding an Indefinite Integral In Exercises 15-34, find the indefinite integral. (Note: Solve by the simplest method-not all require integration by parts.) 24. ( x2 + 1 )2 dixFinding an Indefinite Integral In Exercises 15-34, find the indefinite integral. (Note: Solve by the simplest method-not all require integration by parts.) 24. ( x2 + 1 )2 dix