Answer
$\cos (y)=x$
Work Step by Step
Looking at the right angle triangle given, the equation for cos y, will be the $\frac{adjacent}{hypotenuse}$
The hypotenuse$=1$ and the adjacent$=x$
Therefore $\cos (y)=\frac{x}{1}$
$=x$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 5 - Logarithmic, Exponential, and Other Transcendental Functions - 5.6 Exercises - Page 372: 15
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