Answer
$0$
Work Step by Step
$\tan \alpha =\tan \left( \alpha -2\pi n\right)
\\\Rightarrow \tan \left( 21\pi \right) =\tan \left( 21\pi -20\pi \right)
\\=\tan \pi
\\=\dfrac {\sin \pi }{\cos \pi }
\\=\dfrac {0}{-1}
\\=0$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.3 Properties of the Trigonometric Functions - 6.3 Assess Your Understanding - Page 394: 21
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