Mark against the correct answer in the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in the following:

The solution of the $D E \cos x(1+\cos y) d x-\sin y(1+\sin x) d y=0$ is

A. $1+\sin x \cos y=\mathrm{C}$

B. $(1+\sin x)(1+\cos y)=\mathrm{C}$

C. $\sin x \cos y+\cos x=\mathrm{C}$

D. none of these

Solution:

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