Friday, 21 July 2017

integration - Integral intisqrt33nftyfracdxsqrtx311x2+11x+121


How can we prove I:=33dxx311x2+11x+121=162π2Γ(1/11)Γ(3/11)Γ(4/11)Γ(5/11)Γ(9/11)?





Thoughts of this integral
This integral is in the form 1P(x)dx,where degP=3. Therefore, this integral is an elliptic integral.
Also, I believe this integral is strongly related to Weierstrass elliptic function (u). In order to find g2 and g3, substitute x=t+11/3 to get I=23311/3dt4t3352/3t+6776/27
The question boils down to finding (I;352/3,6776/27) but I seem to be on the wrong track.

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