Такой график на картиночке....
6х-2>4х-1
6х-4х>2-11
2х>1
х>0.5
по формуле Sn= (bn*q-b1)/q-1
254=(2*0.5-b1)/0.5-1
127=1-b1
b1=-126
4cos²x + sinx * cosx + 3sin²x - 3 = 0
4cos²x + sinx * cosx + 3sin²x - 3(sin²x + cos²x) = 0
4cos²x + sinx * cosx + 3sin²x - 3sin²x - 3cos²x = 0
cos²x + sinx * cosx = 0
cosx * (cosx + sinx)=0
cosx = 0
x=π/2 + πn,n ∈ Z
cosx + sinx = 0 |:cosx
1+ tgx = 0
tgx = -1
x=-π/4 + πn,n ∈
Y^2 + 6y + 9 = y^2 + 2*y*3 + 9 = (y+3)^2