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posted by Angela on Sunday, July 24, 2011 at 6:14pm.

simplify the expression 2sin^2 t + cos^2 t-2

2sin^2 t + cos^2 t-2 =2sin^2t + 1 - sin^2t - 2 =sin^2t - 1 which could be factored to (sinx+1)(sinx-1)

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