1. $\left(1-x^2\right)\frac{d^{2}y}{d{x}^2}-x\frac{dy}{dx}=2$

• A. $y={\cos }^{-1}\left(x\right)$
• B. $y={\cos }^{-1}\left(x\right)$
• C. $y={\cos }^{-1}\left(x\right)$
• D. $y={\cos }^{-1}\left(x\right)$

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