N 413
2·TAN(pi/2 - α)/(1 + COT(pi - α)^2) - (COS(pi/2 - α) + SIN(pi/2 - α))^2=
=2·COT(α)/(1 + COT(α)^2) - (SIN(α) + COS(α))^2=
=2·SIN(α)·COS(α) - (2·SIN(α)·COS(α) + 1)= -1
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