This web page plots the polar coordinate function with the argument being the argument a and the function value being the modulo r. Enter the function expression in the edit box following f(a)= below. For the syntax of the function expression, see the <a href="c712">function expression</a> page, but the argument must be written as a! Also enter the range a1 and a2 (a1<a2) of the argument a to be displayed below. The range of the argument is generally the input number, but you can also enter a constant expression. For the input method of the constant expression, see <a href= "c703">Constant expressions</a> pages, often using p for pi. Then click on the "Show Curve" button and the curve for the given function in polar coordinates will be displayed.