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= 1/2 * (sin²α + cos²α + 2 * sinα * cosα - 1) =
= 1/2 * ((sinα + cosα)² - 1) =
= 1/2 * ((2√3/3)² - 1) =
= 1/2 * (4 * 3 / 9 - 1) = 1/2 * (4/3 - 1) = 1/2 * 1/3 = 1/6