Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 5 - Review - Exercises - Page 463: 24

Answer

$sin \space t \gt 0$ $sec \space t = -5/3$ $csc \space t \gt 0$ $cot \space t \lt 0$

Work Step by Step

$$tan \space t = \frac{sin \space t}{cos \space t} \longrightarrow sin \space t = tan \space t \space cos \space t$$ Since $cos \space t$ is negative (-3/5), and $tan \space t$ is negative, the result of the multiplication will be positive: $sin \space t \gt 0$ $$sec \space t = \frac{1}{cos \space t} = \frac{1}{-3/5} = -5/3$$ $$csc \space t = \frac{1}{sin \space t} $$ Since sin t is positive ($> 0$) and 1 is positive, the result of this division will also be positive. $csc \space t \gt 0$ $$cot \space t = \frac{1}{tan\space t}$$ Since 1 is positive and tan t is negative ($\lt 0$), the result of this division will be negative. $cot \space t \lt 0$
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