Question

Calculus: can you use tangent half angle substitution on something like sin^2(x)?

Answer 1

or it can only be used on non squared trig functs?

Answer 2

You definitely can, but it is not worth it. The proper way to integrate is to use the identity:\[\sin^2 (x) = \dfrac{1 - \cos(2x)}{2}\]

Answer 3

Ah, that helps a lot. Thank you!

Answer 4

No problem. :)