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思路:Let u^2 = x+1.
2udu = dx
Original integral = ∫2u^2/[(u^2-1)^2+2] du
= ∫2u^2/[(u^4-2u^2+3] du
Partial fraction leads to an integrand which is integrable.
2udu = dx
Original integral = ∫2u^2/[(u^2-1)^2+2] du
= ∫2u^2/[(u^4-2u^2+3] du
Partial fraction leads to an integrand which is integrable.
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