Find the amplitude of y = -4 cos (2x). a. -2 b. 2 c. -4 d. 4
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section: Chapter Questions
Problem 36RE
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Question
Find the amplitude of y = -4 cos (2x).
a. -2
b. 2
c. -4
d. 4
Expert Solution
Step 1
We know that the amplitude of a function y = a cos x is modulus of a.
It is half the distance between the maximum and minimum value of the function.
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