Y`=(8*(x²+4)-2x*8x)/(x²+4)²=(8x²+32-16x²)/(x²+4)²=(32-16x²)/(x²+4)²=16(2-x²)/(x²+4)²=0 x²=2⇒x=√2∈ [0;3] U x=-√2∉ [0;3] y(0)==0-наим y(√2)=8√2/6=4√2/3-наиб y(3)=24/13