What is the name of a textbook where one could find a good overview of trig substitutions for integration. I currently own Apostol's Vol. 1 & 2 and Vol. 2 doesn't touch them and Vol 1 is almost silent on the topic.
Would Spivak's Calculus go over them? Any help would be amazing.
You do not need to use a book, wikipedia has a nice list of all kinds of integrals, also for trigonometric identities: List of integrals