If \( y=\sqrt{\frac{1-x}{1+x}} \), then \( \left(1-x^{2}\right) \fr...

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If \( y=\sqrt{\frac{1-x}{1+x}} \), then \( \left(1-x^{2}\right) \frac{d y}{d x} \) is equal to
\( \mathrm{P} \)
(a) \( y^{2} \)
(b) \( 1 / y \)
(c) \( -y \)
(d) \( -y / x \)
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