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int(dx)/(1+x^4)^(1/4)=1/2(1/2log(1+z)/(1...

`int(dx)/(1+x^4)^(1/4)=1/2(1/2log(1+z)/(1-z)-tan^(- 1)z)+C` , where (A) `z= (root(4) (1+x^4))/x` (B) `z=x/ (root(4) (1+x^4))` (C) `z=- (root(4) (1+x^4))/x` (D) none of these

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