MCQ
$\sec ^{-1}\left[\frac{x^2+1}{x^2-1}\right]$ का अवकल है :
- A$\frac{2}{\left\{1+x^2\right\}}$
- ✓$\frac{-2}{\left(1+x^2\right)}$
- C$\frac{1}{\left(1+x^2\right)}$
- D$\frac{-1}{\left(1+x^2\right)}$
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