I want to evaluate the following integral using the tangent half-angle substitution t=tan(x2): ∫2π01−cosx3+cosx dx
However, making the substitution gives me 0 for each of the limits of integration, which is obviously incorrect. I know that one way to solve this problem is to notice that, by symmetry, the equivalent integral 2∫π01−cosx3+cosx dx allows the subsitution to work. What are ways to make this substitution work without noticing this symmetry? I know that this general question has been asked on here before, but I am specifically interested in how I can make it work with this substitution.
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