Answer
$1.90337227851$
Work Step by Step
Make sure that the setting for angles is "radians".
Keys:
"shift" or "2nd function"
"cos"
numerical keypad: (-0.32647891)
"="
yields
$1.90337227851$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.