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2sin(pi - a)cos(pi/2 - a) + 3sin^2(pi/2 - a) - 2
2sin(pi - a)cos(pi/2 - a) + 3sin^2(pi/2 - a) - 2
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= 2sin²α - 2 + 3cos²α = -2(1 - sin²α) + 3cos²α = - 2cos²α + 3cos²α = cos²α