Answer
$81.168073^{\circ}$
Work Step by Step
Using degree mode and the inverse tangent function, we find that the angle $\theta$ having tangent value 6.4358841 is $81.168073^{\circ}$
That is, $\theta=\tan^{-1} 6.4358841=81.168073^{\circ}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.3 Trigonometric Functions - 5.3 Exercises - Page 534: 124
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