SIN(11/6·pi)^2 + COS(pi + α)·SIN(3/2·pi - α) - SIN(-α)·SIN(pi - α)=
=(- 1/2)^2 + (- COS(α))·(- COS(α)) - (- SIN(α))·SIN(α)=
=(- 1/2)^2 + COS(α)^2 + SIN(α)^2 =
=1/4 + (COS(α)^2 + SIN(α)^2) =
=1/4 + 1 = 5/4
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