Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 14 Trigonometric Graphs, Identities, and Equations - Chapter Test - Page 969: 9


$\cos^2 x$

Work Step by Step

Using the known identities: $\frac{\sin(\pi/2-x)}{\sec x}=\frac{\cos x}{\frac{1}{\cos x}}=\cos^2 x$
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