Ответы на вопрос:
Sinπ/2=-1 cos3π/2=0 sinπ=0 cosπ=-1 sin4π/7> 0 2ч,cos(-5π/7)=cos5π/7< 0 2ч, sin9π/8< 0 3ч, sin(-3π/8)< 0 4ч⇒ sin4π/7*cos(-5π/7)*sin9π/8*sin(-3π/8)< 0
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