Solve cos x (1 + cos y) dx - sin y (1 + sin x) dy = 0

1. A.
   $(1+\cos x)(1+\sin y)=c$
2. B.
   $1+\sin x+\cos y=c$
3. C.
   $(1+\sin x)(1+\cos y)=c$
4. D.
   $1+\sin x\cdot\cos y=c$

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1. A.
   $(1+\cos x)(1+\sin y)=c$, where $c$ is a constant of integration.
2. B.
   $1+\sin x+\cos y=c$, where $c$ is a constant of integration.
3. C.
   $(1+\sin x)(1+\cos y)=c$, where $c$ is a constant of integration.
4. D.
   $1+\sin x\cos y=c$, where $c$ is a constant of integration.

Tap an option to check your answer.