Find solution \[ (x d y-y d x) \cdot y \sin \left(\frac{y}{x}\right)=(y d x+x d y) \cdot x \cos ...

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Find solution
\[
(x d y-y d x) \cdot y \sin \left(\frac{y}{x}\right)=(y d x+x d y) \cdot x \cos \left(\frac{y}{x}\right)
\]
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