2x - П/4 = ±3П/4 + 2Пk, k∈Z
2x = П + 2Пk и 2x = -П/2 + 2Пk
2x = П + 2Пk 2x = -П/2 + 2Пk
x = П/2 + Пk,k∈Z и x = -П/4 + Пk, k∈Z
4x-2y=-9
3x-3y=-6
4x-2y=-9
x-y=-2
4x-2y=-9
x=y-2
4(y-2)-2y=-9
x=y-2
4y-8-2y=-9
2y=-1
y=-0.5
x=-0.5-2=-2.5
x=-2.5
y=-0.5
=(y^3+5y)(y-3)=y^4+y^3(-3)+5y^3-15y^2=y^4-3y^3+5y^3-15y^2=y^4+2y^3-15y^2