#### Answer

$\tan 72^{0}$

#### Work Step by Step

$\alpha +\beta =\dfrac {\pi }{2}\Rightarrow \tan \alpha =\cot \beta \Rightarrow 72^{0}+18^{0}=\dfrac {\pi }{2}\Rightarrow \cot 18^{0}=\tan 72^{0}$

Published by
Pearson

ISBN 10:
013421742X

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

$\tan 72^{0}$

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