Предмет: Алгебра, автор: 4527577mex

Знайдіть sin α, якщо ctg α = 2 і π < α < 3π поделить на 2

Ответы

Автор ответа: Аноним

2

sin²a=1:(1+ctg²a)=1:(1+4)=1/5
sina=-1/√5

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