Answer
$2$
Work Step by Step
Solve. $1-\tan^2 10^{\circ}+\csc^2 80^{\circ}$
We have
$= 1-\cot^2 (90^{\circ}-10^{\circ})+\csc^2 80^{\circ}$
or, $=1-\cot^2 80^{\circ}+\csc^2 80^{\circ}$
or, $=1+1$
or, $=2$
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 4.3 - Right Triangle Trigonometry - Exercise Set - Page 561: 46
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