112) Cos2α + 2Sin²α = 1 - 2Sin²α + 2Sin²α = 1
113) Cos2α - 2Cos²α = 2Cos²α - 1 - 2Cos²α = - 1
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112) Cos2α + 2Sin²α = 1 - 2Sin²α + 2Sin²α = 1
113) Cos2α - 2Cos²α = 2Cos²α - 1 - 2Cos²α = - 1