Blue function [color=#0000ff]g(x)=1/4x^4-2x^2+5[/color] is the red functions [color=#ff0000]f(x)=x^3−4x[/color] integralfunction. Integralfunctios are form [color=#9900ff]Integral[f]+C[/color] and with the help of trace switch we can easily change the variable C value.