You can use this :
a,b,c = symbols('a b c')
expr = 49*cos(x)**2+49*sin(x)**2 + 5
expr.replace(a*sin(b)**2+a*cos(b)**2, a, exact=True)
# output 49*sin(x)**2 + 49*cos(x)**2 + 5
On Thursday, 18 February 2016 15:14:00 UTC+5:30, Paul Royik wrote:
>
> 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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