Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3819 by abro...@verizon.net: trigsimp gives bad results for
non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=3819
Consider the following code -
from sympy import symbols, trigsimp, sin, cos
(r,th) = symbols('r,th')
(e_r,e_th) = symbols('e_r,e_th',commutative=False)
#(e_r,e_th) = symbols('e_r,e_th')
A = -r*sin(th)**2*e_r - r*sin(th)*cos(th)*e_th
print A
B = A/(r*sin(th))
print B
print trigsimp(B)
the output of print trigsimp(B) is
-2*(sin(th)*e_r + cos(th)*e_th)
if e_r and e_th are commutative symbols the output is
-e_r*sin(th) - e_th*cos(th)
which is correct. There is a problem with trigsimp if the expression
contain non-commutative symbols.
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