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