Decimal Places $x _ { 0 }$ Of a Function $f$

$\text { Approximate the fixed point of the function } f ( x ) = \cos x \text { between } - \frac { \pi } { 2 } \text { and } \frac { \pi } { 2 } \text { to two }$ decimal places. (A fixed po int $x _ { 0 }$ of a function $f$ is a value of $x$ such that $f \left( x _ { 0 } \right) = x _ { 0 }$ .)

A) $0.65$
B) $0.74$
C) 0
D) $1.00$
E) $0.91$