There is a question here <https://stackoverflow.com/questions/55816164/performing-integral-transformation-fails-in-sympy-under-python-2-7-13> about integrating `cos(x)**2` wrt `sin(x)` -- which is something that is no longer permitted in current versions of SymPy and this is not a permitted transform since solution of `u - sin(x)` does not yield a unique solution. Is this something that SymPy should be handling?
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