MCQ
यदि $y=\cot ^{-1}\left(\frac{1-x}{1+x}\right)$ तो $\frac{d y}{d x}=?$
- A$-\frac{1}{1+x^3}$
- ✓$\frac{1}{1+x^2}$
- C$\frac{1}{\left(1+x^2\right)^{\frac{3}{2}}}$
- Dइनमें से कोई नहीं
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