Sin(π + α)+ Cos(2π + α) - Sin(- α) - Cos(- α) =
= - Sinα + Cosα + Sinα - Cosα = 0
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Sin(π + α)+ Cos(2π + α) - Sin(- α) - Cos(- α) =
= - Sinα + Cosα + Sinα - Cosα = 0