I do this:
import sympy
sympy.srepr(sympy.integrate(S('cos(x * y)'), S('(x, 0, a)')))
It returns this:
"Piecewise(ExprCondPair(Mul(Pow(Symbol('y'), Integer(-1)),
sin(Mul(Symbol('a'), Symbol('y')))), And(StrictGreaterThan(Symbol('y'),
-oo), StrictLessThan(Symbol('y'), oo), Unequality(Symbol('y'),
Integer(0)))), ExprCondPair(Symbol('a'), true))"
How do I find the value of the Piecewise expression when y is nonzero? I
have tried using sympy.refine with Q.nonzero, but that has not worked.
Indeed the docs for refine warn, "Relations in assumptions are not
implemented (yet)". Does that mean there's no way to find the value of the
integral assuming y is nonzero?
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