Answer
$x=-\sqrt 2$
Work Step by Step
Here, we have $r =-\sqrt 2\sec \theta$
This implies that
$r=\dfrac{-\sqrt 2}{\cos \theta}$
or, $r \cos \theta =-\sqrt 2$
Thus, we have $x=-\sqrt 2$
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 10 - Practice Exercises - Page 593: 26
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