a = rule.evalf(subs={x: inter.end})
a = rule.subs({x: inter.end}).evalf()
quieston is why this 2 lines gives 2 different ways of calculation infinity?
like I'd eval x**3 - 3*x, where x = +-oo.
First line will give me exactly what I want: +-infinity, and the second one
will give me nan for both value.
I'd like to use first line everytime, but fun thing:
If I have -x-1 and will eval it for -oo, answer is -oo, for +oo -- +oo.
The second one evals it correctly.
Why does it happen?
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