diff-equation

Question: The solution of $\cos (x+y)\,dy=\,\,dx$ is



1) $y=\tan \,\left( \frac{x+y}{2} \right)+c$
2) $y+{{\cos }^{-1}}\left( \frac{y}{x} \right)=c$
3) $y=x\,\,\sec \left( \frac{y}{x} \right)+c$
4) None of these
Solution: Explanation: No Explanation
Variable separable type differential equations

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