The general solution of $e^x\cos y\;dx-e^x\sin y\;dy=0$ is: $$\begin{array}{1 1}(A)\;e^x\cos y=c & (B)\;e^x\sin y=c\\(C)\;e^x=c\;\cos y & (D)\;e^x=c\;\sin y\end{array}$$

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