diff-equation

Question: Differential equation of $y=\sec ({{\tan }^{-1}}x)$ is



1) $(1+{{x}^{2}})\frac{dy}{dx}=y+x$
2) $(1+{{x}^{2}})\frac{dy}{dx}=y-x$
3) $(1+{{x}^{2}})\frac{dy}{dx}=xy$
4) $(1+{{x}^{2}})\frac{dy}{dx}=\frac{x}{y}$
Solution: Explanation: No Explanation
Formation of differential equations

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