Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 3 - Section 3.1 - Reference Angle - 3.1 Problem Set - Page 122: 64

Answer

$135.7^{\circ}$

Work Step by Step

Given- $\csc\theta$ = $1.4325$ , $\theta$ belongs to Q II and $0^{\circ}\leq \theta\lt 360^{\circ}$ We will find reference angle of $\theta$ first, using calculator in degree mode by the$\frac{1}{x}$ and $\sin^{-1}$ key with the value $1.4325$ as $\sin\theta$ = $\frac{1}{\csc\theta}$ $1.4325$ → $\frac{1}{x}$ → $\sin^{-1}$→→ 44.273186733 i.e. reference angle of $\theta$ = $44.3^{\circ}$ (to the nearest tenth of a degree) The desired angle $\theta$ is in Q II, whose reference angle is $44.3^{\circ}$. Also $0^{\circ}\leq \theta\lt 360^{\circ}$ Therefore- $\theta$ = $180^{\circ} - 44.3^{\circ}$ = $135.7^{\circ}$
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