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2018-10-26 10:02:46 -0600 commented question Indefinite integral is incorrect

@tmonteli, I use sage 8.1

2018-10-26 07:08:37 -0600 asked a question Indefinite integral is incorrect

indefinite_integral(sqrt(1+cos(x)**2), x).full_simplify() gives 1/6*sin(x)^3, which is incorrect.

2016-12-01 10:48:17 -0600 commented answer Sage incorrectly evaluates series

OK. Thank you.

2016-12-01 09:11:02 -0600 commented answer Sage incorrectly evaluates series

I've got ValueError: Mathematica cannot make sense of input sum(1/((2*x+1)^2-4)^2,x,0,Infinity, algorithm='mathematica')

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2016-12-01 03:02:43 -0600 asked a question Sage incorrectly evaluates series

It incorrectly evaluates $\displaystyle\sum_{n=0}^{\infty}\frac{1}{((2n+1)^2-4)^2}=\frac{\pi^2}{64}-\frac{1}{12}$, but correct answer is $\displaystyle\frac{\pi^2}{64}$

2016-12-01 03:02:43 -0600 asked a question Sage incorrectly evaluates series

It incorrectly evaluates $\displaystyle\sum_{n=0}^{\infty}\frac{1}{((2n+1)^2-4)^2}=\frac{\pi^2}{64}-\frac{1}{12}$, but correct answer is $\displaystyle\frac{\pi^2}{64}$