Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 5 - Section 5.2 - Trigonometric Functions of Real Numbers - 5.2 Exercises - Page 417: 45

Answer

negative

Work Step by Step

see: Signs of the Trigonometric Functions (p.412) $\left[\begin{array}{lll} Quadrant & Positive & Negative\\ I & all & none\\ II & sin, csc & cos, sec, tan, cot\\ III & tan, cot & sin, csc, cos, sec\\ IV & cos, sec & sin, csc, tan, cot \end{array}\right]$ In Q.II, sine is positive, cosine is negative Their product is negative
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