Cos²(90° + α) + Cos²(180° - α) + tg(270° -α) * tg(180° + α) =
= Sin²α + Cos²α + Ctgα * Tgα = (Sin²α + Cos²α) + (Ctgα * Tgα) = 1 + 1 = 2
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Cos²(90° + α) + Cos²(180° - α) + tg(270° -α) * tg(180° + α) =
= Sin²α + Cos²α + Ctgα * Tgα = (Sin²α + Cos²α) + (Ctgα * Tgα) = 1 + 1 = 2