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Prove that these are equal using Trig identities 

Guest Oct 1, 2018
 #1
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Remember that \(\cos^2x+\sin^2x=1\)

 

Rearrange this in the form:  \(\sin^2x=1-\cos^2x\)

 

Substitute this into the left hand side (LHS) of your identity:

 

LHS:  \(1-\cos^2x-cos^2x\)

 

Simplify

LHS: \(1-2\cos^2x\)

 

So LHS = RHS

.

Alan  Oct 2, 2018

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