SOLUTION: Simplify the expression by using a double-angle formula. 2cos^2 y/3-1

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Question 1012024: Simplify the expression by using a double-angle formula.
2cos^2 y/3-1

Answer by ValorousDawn(53)   (Show Source): You can put this solution on YOUR website!
Recall that
Set the equation equal to the one given.



Then substitute.


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