Cubic Spline Interpolation

Cubic spline algorithm approximating function y=f(x) - ((-2)*x*(2*x+3))/(x*x+4*x+5) in interval [-2 2]-Cubic spline algorithm approximating function y=f(x)- ((-2)*x*(2*x+3))/(x*x+4*x+5) in interval [-2 2]