Draw a polar coordinate curve

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 function expression 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 Constant expressions 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.