Answer
$ y =- \tan x $
Work Step by Step
The required equation is $ y= -\tan x $
We see an upside-down tangent function with no phase shift, which matches with the graph of a normal tangent function with amplitude $-1$.
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 4.6 - Graphs of Other Trigonometric Functions - Exercise Set - Page 609: 4
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