Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 5 - Section 5.2 - Trigonometric Functions of Real Numbers - 5.2 Exercises - Page 418: 66

Answer

$\sin{t} =- \dfrac{\sqrt{17}}{17}$ $\cos{t} = -\dfrac{4\sqrt{17}}{17}$ $\csc{t} = -\sqrt{17}$ $\sec{t} =-\dfrac{\sqrt{17}}{4}$ $\cot{t} =4$

Work Step by Step

$\tan{t} =\dfrac{1}{4}$ $\because t$ terminates in $ QIII \hspace{20pt} \therefore \sec{t} $ is negative $\sec^2{t} = 1+\tan^2{t} \\ \sec{t} = -\sqrt{1+\tan^2{t}} \\ = -\sqrt{1+\left(\dfrac{1}{4}\right)^2} = \sec{t} =-\dfrac{\sqrt{17}}{4}$ $\cos{t} = \dfrac{1}{\sec{t}} = -\dfrac{4\sqrt{17}}{17}$ $\sin{t} = \cos{t} \times \tan{t} = - \dfrac{\sqrt{17}}{17}$ $\csc{t} = \dfrac{1}{\sin{t}} = -\sqrt{17}$ $\cot{t} = \dfrac{1}{\tan{t}} =4$
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