(y+3)² - (y-3)² = 1.5(y-3)(y+3)
y² +6y+9 -(y² -6y+9)=1.5(y² -9)
y² +6y+9-y² +6y-9=1.5y² -13.5
-1.5y² +12y+13.5=0
y² - 8y - 9=0
D=64+36=100
y₁=(8-10)/2= -1
y₂=(8+10)/2=9
Ответ: -1; 9.
<span><span>2arccos0+3arccos1</span>=2х π/2+3х0= π+0= π</span>
=x^2+4x+4-x^2-4x+2x+8=2x+12;
Xˇ2-4x+3 = xˇ2 -6x+8
2x = 5, x=5/2