Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 5 - Mid-Chapter Check Point - Page 684: 17


Please see below.

Work Step by Step

We verify as follows: $$\frac{2\tan x}{1+\tan ^2x}=2\tan x \cos ^2x= 2\frac{\sin x }{\cos x}\cos ^2 x=2\sin x \cos x= \sin 2x = \frac{1}{\csc 2x}$$
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