Use Polar Coordinates to Find the Limit of the Function $$f ( x , y ) = \frac { 9 x y } { \sqrt { x ^ { 2 } + y ^ { 2 } } }$$

Multiple Choice

Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0) .
- $$f ( x , y ) = \frac { 9 x y } { \sqrt { x ^ { 2 } + y ^ { 2 } } }$$

A) $- 1$
B) 0
C) 1
D) $\pi$