ТРИГОНОМЕТРИЧЕСКИЕ УРАВНЕНИЯ 100 БАЛЛОВ
решение-обязательно

cos2x=cos(4п/3)
cos(x-(п/4))=cos(п/4)
cos(x+(п/3))=0
sin^(2)x=0,25
sin10x=√3/2
sin(x/2)=√2/2
cos(x+(п/4))=1
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