Answer
$cosine$.
Work Step by Step
Recall the definitions of trig functions on a unit circle, for $P(x,y)$, we have $cos(t)=x$, thus the answer is $cosine$.
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 5.2 Trigonometric Functions: Unit Circle Approach - 5.2 Assess Your Understanding - Page 402: 7
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