1) 1 - Cos(270⁰ + α )Sin(180⁰ - α ) = 1 - Sinα * Sinα = 1 - Sin²α = Cos²α
2) Cos(π + α)Cos(α + 2π) + Sin²(α - 3π/2) = - Cosα * Cosα + Cos²α =
= - Cos²α + Cos²α = 0
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1) 1 - Cos(270⁰ + α )Sin(180⁰ - α ) = 1 - Sinα * Sinα = 1 - Sin²α = Cos²α
2) Cos(π + α)Cos(α + 2π) + Sin²(α - 3π/2) = - Cosα * Cosα + Cos²α =
= - Cos²α + Cos²α = 0