- #1

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## Homework Statement

cos^2x - cos^4x = cos^2x sin^2x

## Homework Equations

N/A

## The Attempt at a Solution

L.S. = cos^2x -(cos^2x)(cos^2x)

= cos^2x -cos^2x(cos^2x)

I'm stuck here. Am I doing something wrong during the first step? Thanks for your help.