Answer
$29.5061810708^{o}$
Work Step by Step
Make sure that the setting for angles is "degrees".
$\cot^{-1}x$ is evaluated as $\left\{\begin{array}{lll}
\tan^{-1}(1/x) & if & x > 0\\
180^{o}+\tan^{-1}(1/x) & if & x <0
\end{array}\right.$
(x is positive here)
Keys:
"shift" or "2nd function"
"tan"
numerical keypad: (1$\div$1.7670492)
"="
yields
$29.5061810708^{o}$
