Find the second derivative of f(x)=x4−6x2+5f(x) = x^4 - 6x^2 + 5f(x)=x4−6x2+5.
12x2−1212x^2 - 1212x2−12
4x3−12x4x^3 - 12x4x3−12x
4x2−64x^2 - 64x2−6
12x2+1212x^2 + 1212x2+12