Найти производную 2-ого порядка . подробно ...

y"=( y')'y= 8x^2 +1y'=16x., y"=16

(16x*(4-10x^2)-(8x^2+1)*(-20x))/(4-10x^2)^2=(64x-160x^3+160x^3+20x)/(4-10x^2)^2==84x/(16-80x^2+100x^4)=21x/(4-20x^2+25x^4)