Answer
False
Work Step by Step
$\cos{2A} = 2 \cos^2{A} -1 $
$\cos{2A} \neq 2 \cos{A}$
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.