Main
About
SymPy Live
SymPy Gamma
Input:
simplify%28cos%28x%29cos%28y%29 - sin%28x%29sin%28y%29%29
Error:
simplify%28cos%28x%29cos%28y%29 - sin%28x%29sin%28y%29%29
unsupported operand type(s) for %: 'function' and 'Integer'
See what
Wolfram|Alpha
has to say.
Experiment with SymPy at
SymPy Live
.