MCQ
$\int \frac{d x}{x^2-1}=$
- A$\sin ^{-1} x+k$
- ✓$\frac{1}{2} \log \left|\frac{x-1}{x+1}\right|+k$
- C$\frac{1}{2} \log \left|\frac{x+1}{x-1}\right|+k$
- D$\sqrt{1-x^2}+k$
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