Let $f ( x ) = \tan ^ { - 1 } \left( x ^ { 2 } + 1 \right)$

Multiple Choice

Let $f ( x ) = \tan ^ { - 1 } \left( x ^ { 2 } + 1 \right)$ . Find the value of $f ^ { \prime } ( 1 )$ .

A) 0
B) 0.1
C) 0.2
D) 0.3
E) 0.4
F) 0.5
G) 0.6
H) 0.8