123, 321, 211, 222, 231, 132
Ctg²x+2√3ctgx+3sin²x=-3sin²(x-3/2π)
sin²(x-3/2π)=(sin(x-3/2π))²=(sin(-(3/2π-x)))²=(-sin(3/2π-x))²=(cosx)²=cos²x
ctg²x+2√3ctgx+3sin²x=-3cos²x
ctg²x+2√3ctgx+3sin²x+3cos²x=0
ctgx=t
t²+2√3t+1=0
t=-√3
ctgx=-√3
x=π-arcctg√3+πn, n∈Z
x=π-π/6+πn, n∈Z
x=5π/6+πn, n∈Z
-11π/2≤5π/5+πn≤-4π
-11π/2-5π/6≤πn≤-4π-5π/6
-38π/6≤πn≤-29π/6
-38/6≤n≤-29/6
n=-5, n=-6
x₁=5π/6-5π, <u>x₁=-25π/6</u>
x₂=5π/6-6π, <u>x₂=-31π/6</u>
1)0.3; 0.8; 0.02; 0.05; 0.004; 0.007
2)0.6; 0.3; 0.09; 0.04
3)0.123; 0.4; 0.6; 0.075; 0.001
вроде так)))
-3/2-3/5=<span>-3- 2,6= - 5,6</span>
5430г=5,430кг
3025г=3,025кг
62500кг=62,5т
7080кг=7,080т