We can factor out \( \cos y \) from the first term:
\( \cos y (\sin y + x \cos y) dx + x dy = 0 \)
Now, let's rearrange the equation to isolate the differentials:
\( \cos y (\sin y + x \cos y) dx = -x dy \)
Dividing both sides by \( \cos y (\sin y + x \cos y)
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