Question

Запишите в виде произведения

Answer 1

а) 2·sin(½(70+50))·cos(½(70-50))=2·sin(60)·cos(10)
б) 2·sin(½(70-50))·cos(½(70+50))=2·sin(10)·cos(60)
в) 2·cos(½(70+50))·cos(½(70-50))=2·cos(60)·cos(10)
г) -2·sin(½(70+50))·sin(½(70-50))=-2·sin(60)·sin(10)