y=-cos2(x-pi/12) = -sin2(x-pi/12+3pi/12) = -sin2(x+pi/6) I don't understand how you get the 3pi/12. If there is another simpler way to get the same answer, please include it.=]
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This uses the identity: So looking at your expression: (Factored out a 2 of the inside expression) etc. etc.
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