#### Answer

$\dfrac {3\pi }{4}$

#### Work Step by Step

$\arccos \left( \cos x\right) =x\Rightarrow \arccos \left( \cos \dfrac {3\pi }{4}\right) =\dfrac {3\pi }{4}$

Published by
Pearson

ISBN 10:
013421742X

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

$\dfrac {3\pi }{4}$

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