Answer
positive
Work Step by Step
Since $\cos t$ and its reciprocal, $\sec t$ (when defined)
have the SAME SIGN
regardless of the quadrant t belongs to,
their product is always +1.
(positive).
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
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: 48
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