#### Answer

5$\pi$/4

#### Work Step by Step

1. Subtract a full rotation (equivalent to 2$\pi$)
13$\pi$/4 -2$\pi$ = 5$\pi$/4
Because you subtracted a full rotation these two angles are equivalent to one another.

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

5$\pi$/4

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