Find the derivative of f(x)=(x2+1)2f(x) = (x^2+1)^2f(x)=(x2+1)2.
2(x2+1)2(x^2+1)2(x2+1)
4x(x2+1)4x(x^2+1)4x(x2+1)
4x3+4x4x^3 + 4x4x3+4x
Both b and c