I'm trying to simplify a*cos(b)**2+a*sin(b)**2 to a
So, I write
a = sympy.Wild('a')
b = sympy.Wild('b')
expr = 49*cos(x)**2+49*sin(x)**2 + 5
expr.replace(a*sympy.sin(b)**2+a*sympy.cos(b)**2, a, exact=True)
But this doesn't work. expr is unchanged.
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