If \(\rm z = \tan^{-1} \frac y x\) then the value of \(\rm \frac {\partial^2z}{\partial x^2} + \frac {\partial^2 z}{\partial y^2}\) is equal to-

If \(\rm z = \tan^{-1} \frac y x\) then the value of \(\rm \frac {\

1.	If \(\rm z = \tan^{-1} \frac y x\) then the value of \(\rm \frac {\partial^2z}{\partial x^2} + \frac {\partial^2 z}{\partial y^2}\) is equal to-
A.	\(\rm \frac {-y}{x^2 + y^2}\)
B.	\(\rm \frac {x}{x^2 + y^2}\)
C.	\(\rm \frac {2xy}{x^2 + y^2}\)
D.	0
Answer» E.

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If \(\rm z = \tan^{-1} \frac y x\) then the value of \(\rm \frac {\partial^2z}{\partial x^2} + \frac {\partial^2 z}{\partial y^2}\) is equal to-

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