Let $f ( x , y ) = \tan ^ { - 1 } ( x / y )$

Let $f ( x , y ) = \tan ^ { - 1 } ( x / y )$ . Find the value of the partial derivative $f _ { y } ( 1,2 )$ .

A) $- 1$

B) $- \frac { 1 } { 2 }$
C) $- \frac { 1 } { 3 }$
D) $- \frac { 1 } { 5 }$
E) $\frac { 1 } { 5 }$
F) $\frac { 1 } { 3 }$

G) $\frac { 1 } { 2 }$

H) 1

Correct Answer:

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