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For what it's worth, Maxima is the one causing the hang.

(%i1) limit( (sin((h + x)^2) - sin(x^2))/h, h, 0);
                                       2
(%o1)                             2 x cos(x )

(%i3) limit( (sin((%pi+h)^2)-sin(%pi^2))/h,h,0);

But I can't diagnose it any further than that. Replacing %pi with 2 or something does the same (well, unless x=0).