Answer
$1$
Work Step by Step
We know that:
$\sec x=\dfrac{1}{\cos (x)}$
Therefore, $( \sec 50^{\circ}) ( \cos 50^{\circ})=\dfrac{1}{\cos 50^{\circ}} \times \cos 50^{\circ}=1$
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 - Chapter Review - Review Exercises - Page 458: 12
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