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: 36


$\theta$ = 12$^{\circ}$

Work Step by Step

$\cot$(5$\theta$ + 2$^{\circ}$) = $\tan$(2$\theta$ + 4$^{\circ}$) $\tan$ and $\cot$ are cofunctions if the sum of the angles is 90$^{\circ}$ Therefore: (5$\theta$ + 2$^{\circ}$) + (2$\theta$ + 4$^{\circ}$) = 90$^{\circ}$ 7$\theta$ + 6$^{\circ}$ = 90$^{\circ}$ 7$\theta$ = 84$^{\circ}$ $\theta$ = 12$^{\circ}$
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