On Friday, March 14, 2014 9:30:24 PM UTC+4, [email protected] wrote:
>
> 3. If I knew that one term is in the form of "(a - b)", would the help?
>
Yes, for example:
In [2]: e = a**4 - 4*a**3*b + 6*a**2*b**2 - 4*a*b**3 - a + b**4
In [3]: e
Out[3]:
4 3 2 2 3 4
a - 4⋅a ⋅b + 6⋅a ⋅b - 4⋅a⋅b - a + b
In [4]: e2 = e.subs(a, x + b)
In [5]: e2.expand()
Out[5]:
4
-b + x - x
In [6]: e2.expand().subs(x, a - b)
Out[6]:
4
-a + (a - b)
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