differentiation

Question: If $z={{\tan }^{-1}}\left( \frac{x}{y} \right)$, then ${{z}_{x}}:{{z}_{y}}=$



1) $y:x$
2) $x:y$
3) $-y:x$
4) $-x:y$
Solution: Explanation: No Explanation
Partial differentiation

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