Answer
cosine, sine
Work Step by Step
If $t$ is a real number and $P=\left( x,y \right)$ is a point on the unit circle that corresponds to $t$ , then $x$ is the cosine of $t$ and $y$ is the sine of $t$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Concept and Vocabulary Check - Page 546: 2
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