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

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

1.	If \[z={{\tan }^{-1}}\left( \frac{x}{y} \right)\], then \[{{z}_{x}}:{{z}_{y}}=\]
A.	\[y:x\]
B.	\[x:y\]
C.	\[-y:x\]
D.	\[-x:y\]
Answer» D. \[-x:y\]

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

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