Answer
All are positive.
Work Step by Step
A $-345^{\circ}$ angle is in the first quadrant, with $x$, $y$, and $r$ all positive. So the values of all trigonometric functions are positive in the first quadrant.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.2 Trigonometric Functions - 5.2 Exercises - Page 519: 107
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