which contains 'INTEGRATE(x-x^3,x), which is obviously
integrable. ev(...,integrate) successfully completes the
integration, and ratsimp gets it down to something nice.
Similar things happen with sin(a*asin(x)) for other a's.
Note that trigexpand(sin(3*asin(x))) = 3*x*(1-x^2)-x^3.
Low priority, because the answer is correct (if not ideal)
and can easily be fixed.
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