#### Answer

$\csc$

#### Work Step by Step

$\cos \alpha =\dfrac {1}{sec\alpha }=\dfrac {1}{csc\left( 90^{0}-\alpha \right) }\Rightarrow \cos 70=\dfrac {1}{sec70}=\dfrac {1}{csc20}$

Published by
Pearson

ISBN 10:
013421742X

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

$\csc$

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