MCQ
$\int_{}^{} {\frac{{dx}}{{x\sqrt {{x^4} - 1} }}} $ =
- ✓$\frac{1}{2}{\sec ^{ - 1}}{x^2} + k$
- B$\log x\sqrt {{x^4} - 1} + k$
- C$x\log \sqrt {{x^4} - 1} + k$
- D$\log \sqrt {{x^4} - 1} + k$
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