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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