#### Answer

E

#### Work Step by Step

$\cos \left( x+y\right) =\cos x\cos y-\sin x\sin y\Rightarrow 1\rightarrow E$

Published by
Pearson

ISBN 10:
013421742X

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

E

$\cos \left( x+y\right) =\cos x\cos y-\sin x\sin y\Rightarrow 1\rightarrow E$

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