Regarde - DOS Equation Grapher is an equation graphing program. It can plot polynomials, trig, absolute value, inverse trig, hyperbolic and log functions in the form y=f(x). It can show applications of calculus, and work out and plot the derivatives of equations (dy/dx).You can display several graphs on screen at the same time, and zoom in and out on the horizontal and vertical planes separately. Images can be saved in Encapsulated Postscript format (EPS) or printed.Regarde is designed for high school teachers and students.