Ответы на вопрос:
1sin(π+π/8)=-sinπ/8 cos9π/8=cos(π+π/8)=-cosπ/8=-sin3π/8 -sinπ/8> -sin3π/8 sin9π/8> cos9π/8 2 cos3π/10=cos(π/2-π/5)=sinπ/5 sinπ/8< sinπ/5 sinπ/8< cos3π/10
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