Answer
$\cos\theta=\sin\theta$
Work Step by Step
$x=y$
Substitute $x$ by $r\cos\theta$ and $y$ by $r\sin\theta$:
$r\cos\theta=r\sin\theta$
Simplify:
$\cos\theta=\sin\theta$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 8 - Section 8.1 - Polar Coordinates - 8.1 Exercises - Page 593: 45
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