JEE Advance - Mathematics (1984 - No. 10)

Evaluate the following $$\int {{{dx} \over {{x^2}{{\left( {{x^4} + 1} \right)}^{3/4}}}}} $$

- (1 + x^4)^(1/4) + C

- (1 + 1/x^4)^(1/4) + C

(1 + 1/x^4)^(1/4) + C

(1 + x^4)^(3/4) + C

- (1 + 1/x^2)^(1/2) + C