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if int (x-1)^2/(x^4+x^2+1)dx=1/sqrta tan...

if `int (x-1)^2/(x^4+x^2+1)dx=1/sqrta tan^-1 ((x^2-1)/(xsqrt3))-b/sqrta tan^-1((2x^2+1)/3)+c` then `a^2+b^2` is

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