Answer
A. -1/2
B. -$\sqrt 3/2$
C. $1/\sqrt 3$
Work Step by Step
Check unit circle! If the value is negative simply add $2\pi$ to the answer until you get a value within the range of 0 $\leq$ r $\leq$ $2\pi$. If the value is higher subtract!
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: 5
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