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Show that the function f(x)=x^-4 +cos(-2x) is even, odd, or neither."

Show that the function f(x)=x^-4 +cos(-2x) is even, odd, or neither."

Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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I asked this question previously but did not understand a step. 

"Show that the function f(x)=x^-4 +cos(-2x) is even, odd, or neither."

In the attachment, from step 2 to step 3, how does it go from cos (2x) to cos (-2x)?

3+ 37 2 4-
Transcribed Image Text:3+ 37 2 4-
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