1.y=3+(x^3)/3-x^3
y"(x)=3(x^2)/3-3(x^2)=x^2-3x^2=-2x^2
2.y=ln(2x^6-5x^2)
y"(x)=1/(x^2(2x^4-5))*(2x^6-5x^2)"=1/(x^2(2x^4-5))*(12x^5-10x)=(12x^5-10)/(2x^5-5x)
1.y=3+(x^3)/3-x^3
y"(x)=3(x^2)/3-3(x^2)=x^2-3x^2=-2x^2
2.y=ln(2x^6-5x^2)
y"(x)=1/(x^2(2x^4-5))*(2x^6-5x^2)"=1/(x^2(2x^4-5))*(12x^5-10x)=(12x^5-10)/(2x^5-5x)