#### Answer

$\dfrac {\sqrt {2}}{2}$

#### Work Step by Step

$a=1\times \cos 45=\cos 45=\dfrac {\sqrt {2}}{2}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$\dfrac {\sqrt {2}}{2}$

$a=1\times \cos 45=\cos 45=\dfrac {\sqrt {2}}{2}$

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.