On Sep 28, 11:09 am, Johannes <[email protected]> wrote:
> I'm wondering about on more little thing:
> I have an expression like this:
> (-bc)/((1/b -1) bc -1) + c /((1/b -1) bc -1) + (-1)/((1/b -1) bc -1) -1
> which could be simplified by hand to (-2(bc +1)/(c-bc -1)
> why do i get this complex expression, evne if I call simplify on it?
> maybe this question is related to the one of Aidan too (
> 'simplifying expressions')
>
> greatz Johannes
You need to try harder to simplify...
sage: var('b c')
(b, c)
sage: expr = (-b*c)/((1/b -1)* b*c -1) + c /((1/b -1)* b*c -1) + (-1)/
((1/b -1)* b*c -1) + c /((1/b -1)* b*c -1) + (-1)/((1/b -1)* b*c -1)
-1
sage: expr.simplify [hit tab]
expr.simplify expr.simplify_full
expr.simplify_rational
expr.simplify_exp expr.simplify_log expr.simplify_trig
expr.simplify_factorial expr.simplify_radical
sage: sage: expr.simplify_rational()
0
(or if you have no good guess, you can also try simplify_full)
cheers,
Yann
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