((x^3)+4)/2x^2 - найдите производную функции (y' и y")

F`(x)=(3x²*2x²-2x(x³+4))/4x^4=(6x^4-2x^4-8x)/4x^4=(4x^4-8x)/4x^4=
=4x(x³-2)/4x^4=(x³-2)/x³
f``(x)=(3x²*x³-3x²(x³-2))/x^6=(3x^5-3x^5+6x²)/x^6=6x²/x^6=6/x^4