Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises - Page 38: 74


$\sin\theta=\frac{y}{r}=\frac{-4}{5}$ $\cos\theta=\frac{x}{r}=\frac{-3}{5}$ $\tan\theta=\frac{y}{x}=\frac{4}{3}$ $\cot\theta=\frac{x}{y}=\frac{3}{4}$ $\sec\theta=\frac{r}{x}=\frac{5}{-3}$ $\csc\theta=\frac{r}{y}=\frac{5}{-4}$

Work Step by Step

1. The angle is in the III quadrant, therefore, x and y are negative. 2.Lets find the y, by using the x, r and distance formula $r=\sqrt {(-3)^{2}+(y)^{2}} =5 $ $25=9+y^{2}$ $y^{2}=16$ $y=-4$ 3. Insert the values to find trig functions $\sin\theta=\frac{y}{r}=\frac{-4}{5}$ $\cos\theta=\frac{x}{r}=\frac{-3}{5}$ $\tan\theta=\frac{y}{x}=\frac{4}{3}$ $\cot\theta=\frac{x}{y}=\frac{3}{4}$ $\sec\theta=\frac{r}{x}=\frac{5}{-3}$ $\csc\theta=\frac{r}{y}=\frac{5}{-4}$
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