Hi
I've tried subs() for this but it's not working for me. I have the
following expression:
j*(3*x**4 + 6*x**2*y**2 - 24*x**2*z**2 + 3*y**4 - 24*y**2*z**2 +
8*z**4)/(2*(x**2 + y**2 + z**2)**(9/2))
I want to simplify it by making the substitutions r = sympy.sqrt(x*x + y*y
+ z*z) and s = sympy.sqrt(x*x + y*y) so that it becomes something like
j/r**9*(4*z**2*(z**2 - 3*s**2) + 3/2*s**4)
can this be done with sympy, and if so how?
Thanks
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