I've already known that
∞∫01√t(t2+21t+112)dt=14π√7Γ(17)Γ(27)Γ(47)
To get this answer, I let du=d√t, then got
∞∫01√t(t2+21t+112)dt=2∞∫01√u4+21u2+112du
2∞∫01√u4+21u2+112du=2∞∫01√u2+212+√74i√u2+212−√74idu
and it was pretty like Incomplete elliptic integral of the first kind.
But, how to carry on?
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