SOLUTION: Verify the identity 3 cos^2 B − 3 sin^2 B = 6 cos^2 B − 3 Thanks!

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Question 964188: Verify the identity
3 cos^2 B − 3 sin^2 B = 6 cos^2 B − 3
Thanks!
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Verify the identity
3 cos^2 B - 3 sin^2 B = 6 cos^2 B - 3
cos^2 B - sin^2 B = 2cos^2 B - 1
cos^2 = sin^2 + 2cos^2 - 1
cos^2 = sin^2 + cos^2 + cos^2 - 1
cos^2 = 1 + cos^2 - 1
cos^2 = cos^2
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If anyone wants to comment about working on one side only, pls post an example to show that it makes a difference.