HI,
Also feel similar kind of problem. In your case you can do
>>> from sympy.simplify.fu import fu
>>> fu(S.Half - cos(2*x)/2)
# o/p: sin(x)**2
>>> from sympy.simplify.fu import TR7
>>> TR7(cos(x)**2)
# o/p: cos(2*x)/2 + 1/2
Hope these will help.
--
Shekhar
On Tuesday, 31 May 2016 03:43:06 UTC+5:30, chaowen guo wrote:
>
> Hi:
>
> My formula has a lot of square of half angle trigonometric functions. We
> all know that sin(x/2)**2=(1-cos(x))/2 and cos(x/2)**2=(1+cos(x))/2. But
> how to do that in sympy? I try trigsimp and expand_trig, both of them are
> not working.
>
> import sympy
> x=sympy.symbols('x',real=True)
> sympy.expand_trig(sympy.cos(x/2)**2)
> sympy.trigsimp(sympy.sin(x/2)**2)
>
> output is the original half angle formula.
>
> Is there any function like trigreduce in maxima? It does such job.
>
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