Ответы на вопрос:
Cos(π+π/5)sin(π/2-π/5)-sin(π+π/5)*(-sin(π-π/5))= =-cosπ/5*cosπ/π/5)*(-sinπ/5)=-cos²π/5-sin²π/5=-(cos²π/5+sin²π/5)=-1
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