If \[y=\sqrt{(1-x)(1+x)}\], then

1.	If \[y=\sqrt{(1-x)(1+x)}\], then
A.	\[(1-{{x}^{2}})\frac{dy}{dx}-xy=0\]
B.	\[(1-{{x}^{2}})\frac{dy}{dx}+xy=0\]
C.	\[(1-{{x}^{2}})\frac{dy}{dx}-2xy=0\]
D.	\[(1-{{x}^{2}})\frac{dy}{dx}+2xy=0\]
Answer» C. \[(1-{{x}^{2}})\frac{dy}{dx}-2xy=0\]

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If \[y=\sqrt{(1-x)(1+x)}\], then

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