Thursday, January 2, 2020

definite integrals - How to show that inti0nftyfrac1sqrtt(t2+21t+112)dt=frac14pisqrt7Gamma(frac17)Gamma(frac27)Gamma(frac47)

I've already known that

01t(t2+21t+112)dt=14π7Γ(17)Γ(27)Γ(47)



To get this answer, I let du=dt, then got



01t(t2+21t+112)dt=201u4+21u2+112du



201u4+21u2+112du=201u2+212+74iu2+21274idu



and it was pretty like Incomplete elliptic integral of the first kind.




But, how to carry on?

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