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pole = 1/2 * 12 * 10 * sin30 = 60 * 1/2 = 30cm^2
2. sinα = sin(180-α)
cosα = -cos(180-α)
tgα = tg(α-180) = -tg(180-α)
sin135 + tg120 * cos150 = sin(180-135) + (-tg(180-120) * (-cos(180-150)) =
= sin45 + tg60 * cos30 = √2/2 + √3 * √3/2 = √2/2 + 3/2 = (3+√2)/2