Advanced Mathematics - Antiderivative types - odd and even powers
Antiderivative types - odd and even powers
We can use the double angle formulae,  to convert these functions to a
form that is easy to anti differentiate.
cos 2ax = cos2 ax - sin2 ax = 2cos2 ax - 1 = 1 - 2sin2 ax
sin_ ax_ = 1/2 (1 - cos2_ ax_)
cos_ ax_ = 1/2 (1 + cos2_ ax_)
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