#### Answer

$0.783572952917$

#### Work Step by Step

Make sure that the setting for angles is "radians".
$\cot^{-1}x$ is evaluated as $\left\{\begin{array}{lll}
\tan^{-1}(1/x) & if & x > 0\\
\pi+\tan^{-1}(1/x) & if & x <0
\end{array}\right.$
(x is positive here)
Keys:
"shift" or "2nd function"
"tan"
numerical keypad: ($ 1\div$1.0036571)
"="
yields
$0.783572952917$