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## Homework Statement

Sin [tex]^{4}[/tex]X - cos[tex]^{4}[/tex]X

## Homework Equations

## The Attempt at a Solution

I'm just checking if I can switch the sin and cos at the beginning to make:

-Cos[tex]^{4}[/tex]X + Sin[tex]^{4}[/tex]X

Then multiply by -1 to basically switch the the Sin and Cos around?

I'm supposed to simplify, and if all that works I get Cos2x. Is this right?