# Chapter 10 - Review - Exercises - Page 690: 3

$y=\frac{1}{x}, 0\lt x \leq 1$

#### Work Step by Step

$x=cos\theta$ $y=sec\theta=\frac{1}{x}$ However since $0\leq \theta\lt \pi/2, 0\lt cos\theta \leq 1$ Therefore, $y=\frac{1}{x}, 0\lt x \leq 1$ Also see attached graph

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