Consider a toy expression:
expr = Sin[x (a + b)]/(y (z + c))
I would like to expand all parentheses to get something like:
Sin[a x + b x]/(c y + y z)
I have been able to expand the argument of the
Sin term using:
MapAll[Expand,expr] (* Out = Sin[a x + b x]/(y (c + z)) *)
However, this leaves the denominator unexpanded. Is there a way to expand the entire expression?