18sin390(Желательно с объяснением)
Заранее
alenka1408
3
08.06.2020 02:20
0
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1
9
Пошаговое объяснение:
18sin(390°)=18×sin(360+30)=18×sin30°=18×1/2=9
Вычтем 1 полный круг
18*sin 390=18*sin(360+30)=
18*sin30=18*(1/2)=9.
ИЛИ по формуле приведения.