Непонятное условие).........
Tg2x = -3/√3
tg2x = - √3
2x = -arctg √3 + πn
2x = - π/3 + πn
x = - π/6 + πn/2
π/3 ≤ - π/6 + πn/2 ≤ 3π/2
2π ≤ - π + 3πn ≤ 9π
3π≤ <span>3πn ≤ 10π
1 </span>≤ n ≤ 10/3
n = 1 n = 2 n = 3
x = π/3 x = 5π/6 x = 4π/3
Количество корней: 3
1)87-40-17 = 30
2)30*2=60
3)187-60=127
А) 748+423=1171
18*1171=21078
50498-21078=29420
б) 166*59=9794
12040:56=215
9794+215=10009
в) 9009:13=693
3740:34=110
693-110=583