Posted by
**Natash** on
.

Prove that

cos4x=8cos^4x-8cos^2x+1

so I'm guessing you begin with the left side cos4x=cos2(2x) then im kinda lost

Saturday

March 25, 2017
Posted by
**Natash** on
.

Prove that

cos4x=8cos^4x-8cos^2x+1

so I'm guessing you begin with the left side cos4x=cos2(2x) then im kinda lost

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