On 18 February 2016 at 09:43, Paul Royik <distantjob...@gmail.com> 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.
How about:
>>> x = Symbol('x')
>>> trigsimp(49*cos(x)**2 + 49*sin(x)**2 + 5)
54
Or is your question about the fact that expr.replace does not modify
expr but rather returns a different expression? Maybe you wanted
something like:
expr = expr.replace(...)
--
Oscar
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