Determine Whether $f$ Is Even, Odd, or Neither $$f ( x ) = \frac { 4 x ^ { 2 } } { x ^ { 4 } + 5 }$$

Determine whether $f$ is even, odd, or neither.
$$f ( x ) = \frac { 4 x ^ { 2 } } { x ^ { 4 } + 5 }$$