Find $\left( f ^ { - 1 } \right) ^ { t }$

Short Answer

Find $\left( f ^ { - 1 } \right) ^ { t }$$( a )$ $$f ( x ) = 7 + x ^ { 2 } + \tan \left( \frac { \pi x } { 2 } \right) , - 1 < x < 1 , a = 7$$