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Which of the following functiors are even/ odd, and which are neither even no
ogd? (i) \( f ( x ) = \frac { x ^ { 2 } + 1 } { \left( x ^ { 4 } + 1 \right) ^ { 2 } } \) (ini) \( f ( x ) = \log \frac { 1 + x } { 1 - x } \) (ii) \( f ( x ) = x ^ { 2 } + \sec x \) \( ( \) iv \( ) f ( x ) = \left\{ \begin{array} { l } { 0 } \\ { 1 } \end{array} \right. \) if \( x \) is rational if \( x \) irrational
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