Status: New
Owner: ----
Labels: Type-Defect Priority-Medium IPython
New issue 3824 by [email protected]: substitution with a term
containing a sqrt, sin and cos fails
http://code.google.com/p/sympy/issues/detail?id=3824
Hello,
for the following term the substitution is correct:
test = 2* sp.sqrt(2)*sp.cos(sp.symbols("a"))*sp.sin(sp.symbols("a"))
test = test.subs({2*sp.sin(sp.symbols("a"))*sp.cos(sp.symbols("a")):
sp.sin(2*sp.symbols("a"))})
in my IPython notebook I get for test:
sqrt(2)*sin(2a)
___________________________________________________________________
the subs method has problems in the following case:
test2 = -2* sp.sqrt(2)*sp.cos(sp.symbols("a"))*sp.sin(sp.symbols("a"))
test2 = test2.subs({2*sp.sin(sp.symbols("a"))*sp.cos(sp.symbols("a")):
sp.sin(2*sp.symbols("a"))})
in my IPython Notebook I get for test2:
test2 = -sin(2a)
The question is: where is the sp.sqrt(2)
___________________________________________________________________
I tested this in python 2.7 and in my Ipython notebook. Both running sympy
0.7.2
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