(1 + SIN(360° - α))·(1 + COS(90° - α))/SIN(90° - α)=
=(1 - SIN(α))·(1 + SIN(α))/COS(α)=
=(1 - SIN(α)^2)/COS(α)=
=COS(α)^2/COS(α) = COS(α)
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