Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 2 - Acute Angles and Right Triangles - Section 2.1 Trigonometric Functions of Acute Angles - 2.1 Exercises: 34

Answer

$\theta$ = 20$^{\circ}$

Work Step by Step

$\sec$($\theta$ + 10$^{\circ}$) = $\csc$(2$\theta$ + 20$^{\circ}$) $\sec$ and $\csc$ are cofunctions if the sum of the angles is 90$^{\circ}$ Therefore: ($\theta$ + 10$^{\circ}$) + (2$\theta$ + 20$^{\circ}$) = 90$^{\circ}$ 3$\theta$ + 30$^{\circ}$ = 90$^{\circ}$ 3$\theta$ = 60$^{\circ}$ $\theta$ = 20$^{\circ}$
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