Answer
$ \sin ^{2} \theta+\cos ^{2} \theta=1$
Work Step by Step
Equation of a Unit circle $x^{2}+y^{2}=1$
Recall that $(x, y)=(\cos \theta, \sin \theta)$
Thus, substituting results to $\cos^{2} \theta+\sin ^{2} \theta=1$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.3 Properties of the Trigonometric Functions - 5.3 Assess Your Understanding - Page 417: 9
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