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seen May 15 '13 at 9:30

Feb
25
asked Differentiation under the double integral sign
Sep
19
answered Transforming a sum in an integral
Sep
13
awarded  Editor
Sep
13
revised Transforming a sum in an integral
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Sep
13
revised Transforming a sum in an integral
edited tags
Sep
13
answered Transforming a sum in an integral
Sep
12
comment Indefinite integral $\int^{\infty}_{0}\frac{x}{x^4+1}dx$ via residues
See here math.stackexchange.com/questions/60443/…
Sep
12
awarded  Teacher
Sep
12
answered Why does this expression equal $\pi$?
Sep
12
comment How to justify term-by-term expansion to compute an integral
Sorry but i don't know how to calculate this integral by series. I hope this will be useful for you ,despite the fact it doesn't use series
Sep
12
answered How to justify term-by-term expansion to compute an integral
Sep
11
asked Transforming a sum in an integral
Sep
11
comment Difficult integral
I did the calculations with derive!It's all right!
Sep
11
comment Difficult integral
I don't know how to handle this integral. I think he means that $v' = \frac{{\sqrt 2 }}{2}v - \frac{{\sqrt 2 }}{2}w$ and $w' = \frac{{\sqrt 2 }}{2}v + \frac{{\sqrt 2 }}{2}w$. The derivate is of v' now. If you do the calculations you get the correct answer.
Sep
11
comment Difficult integral
Can you explain me the formula of quadratic form?If there are other threads about this thing please send me to these.
Sep
11
awarded  Supporter
Sep
11
awarded  Nice Question
Sep
11
comment Difficult integral
i want to tell you that there is a mistake. THe quantity in the square root is $4wv-u^2$
Sep
11
comment Difficult integral
u,v and w are defined in the article, they are positive!
Sep
11
comment Difficult integral
i think the only restrictions are that the quantity in the square root is positive and the denominator don't vanish!