Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 5 - Trigonometric Functions - 5.3 Trigonometric Functions Values and Angle Measures - 5.3 Exercises - Page 531: 16

Answer

$c=5$ $\sin B=\frac{4}{5}$ $\cos B=\frac{3}{5}$ $\tan B=\frac{4}{3}$ $\csc B=\frac{5}{4}$ $\sec B=\frac{5}{3}$ $\cot B=\frac{3}{4}$

Work Step by Step

$c=\sqrt {a^{2}+b^{2}}=\sqrt {3^{2}+4^{2}}=5$ $\sin B=\frac{\text{side opposite}}{\text{hypotenuse}}=\frac{b}{c}=\frac{4}{5}$ $\cos B=\frac{\text{side adjacent}}{\text{hypotenuse}}=\frac{a}{c}=\frac{3}{5}$ $\tan B=\frac{\text{side opposite}}{\text{side adjacent}}=\frac{b}{a}=\frac{4}{3}$ The cosecant, secant, and cotangent ratios are reciprocals of the sine, cosine, and tangent values, respectively, so we have $\csc B=\frac{5}{4}$ $\sec B=\frac{5}{3}$ $\cot B=\frac{3}{4}$
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