#### Answer

D

#### Work Step by Step

$\cos \left( x-\dfrac {\pi }{2}\right) =\cos x\cos \dfrac {\pi }{2}+\sin x\sin \dfrac {\pi }{2}=\cos x\times 0+\sin x\times 1=\sin x\Rightarrow 5\rightarrow D$

Published by
Pearson

ISBN 10:
013421742X

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

D

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