______________№1____________________
Cos B = √(1 - sin² B) = √(1 - 9/25) = 4/5
tg B = sin B/cos B = 3/5 : 4/5 = 3/4
tg B = AC /CB
CB = AC /tg B
CB = 3 : 3/4 = 4.
ответ 4.
______________№1____________________
Cos B = √(1 - sin² B) = √(1 - 9/25) = 4/5
tg B = sin B/cos B = 3/5 : 4/5 = 3/4
tg B = AC /CB
CB = AC /tg B
CB = 3 : 3/4 = 4.
ответ 4.