1y'=3x^2-3/x^2x ≠ 03x^2-3/x^2=03(x^4-1)=03(x-1)(x+1)(x^2+1)=0x1=-1x2=12y=x^3-6x^2+9x-4y'=3x^2-12x+93x^2-12x+9=03(x^2-4x+3)=03*x-3)(x-1)=0x1=1x2=3y(1)=0 maxy(3)=-4 miny=x^5/5-4/3*x^3+9y'=x^4-4x^2x^4-4x^2=0x^2(x-2)(x+2)=0x1=-2x2-0x3=2y(-2)=199/15 maxy(0)=9y(2)=71/15 min4y=x^3+3/2x^2-6x+21y'=3x^2+3x-63x^2+3x-6=03(x^2+x-2)=0x1=1x2=-2y(-1)=27,5 maxy(1)=17,5 miny(2)=23