#### Answer

$1$

#### Work Step by Step

$\tan45^{\circ}=\frac{\sin45^{\circ}}{\cos45^{\circ}}$
$\tan45^{\circ}=\frac{\frac{\sqrt2}{2}}{\frac{\sqrt2}{2}}$
$\tan45^{\circ}=1$

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

$1$

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