This page draws the shape and surface of the binary function f(r, a) expressed in polar coordinates, where r is the amplitude mode and a is the angle of the xy plane. In the following input boxes, the definition of the binary function f(r, a) is input in a high-level language-like expression. For example, the rotation paraboloid is \(r^2\) or \(r*r\), and some commonly used functions are also supported. See the input method <a href="c703">Constant expression calculation page</a> and <a href="c713">binary function value calculation page</a>, but the arguments can only be represented by the letters r and a. Never use x, y. You must also enter the image range of the surface, r1, r2 is the drawing range of the modulo, t1 < t2, a1, a2 is the drawing range of the angle a, a1 < a2, these four numbers can be input with a constant expression, for example, \((2*p)^{\frac{1}{2}} \) represents the square of the pi of 2 times, and so on. For the input syntax of constant expressions, see " <a href="c703">Constant Expression</a>" page, enter the individual data and click the "Start Drawing" button, the surface of the function will be displayed.