Comment #1 on issue 2671 by [email protected]: constantsimp() isn't working
for dsolve(w(t).diff(t, 6) - k**6*w(t), w(t))
http://code.google.com/p/sympy/issues/detail?id=2671
This requires pre-conditioning since constantsimp doesn't do any
simplification:
>>> a = C2*cos(sqrt(3)*t/2) + C3*cos(sqrt(3)*t/2)
>>> constantsimp(a,t,2)
C2*cos(sqrt(3)*t/2) + C3*cos(sqrt(3)*t/2)
>>> factor(_)
(C2 + C3)*cos(sqrt(3)*t/2)
>>> constantsimp(_,t,2)
C2*cos(sqrt(3)*t/2)
If you try preconditioning with terms_gcd(add, expand=False) for all Adds
in the top level Muls in the expression, perhaps that would work:
>>> eq=y+3*z*(x*y+x*z)+exp(4*x)
>>> [terms_gcd(a,expand=0) for m in Add.make_args(eq) for a in
Mul.make_args(m)
if a.is_Add]
[x*(y + z)]
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