<listitem><para>Cartesians plots can either be written as ⪚ <quote>y = x^2</quote>, where x has to be used as the variable; or as ⪚ <quote>f(a) = a^2</quote>, where the name of the variable is arbitrary.</para></listitem>
<listitem><para>Parametric plots are similar to Cartesian plots. The x and y coordinates can be entered as equations in t, ⪚ <quote>x = sin(t)</quote>, <quote>y = cos(t)</quote>, or as functions, ⪚ <quote>f_x(s) = sin(s)</quote>, <quote>f_y(s) = cos(s)</quote>.</para></listitem>
<listitem><para>Polar plots are also similar to Cartesian plots. They can be either be entered as an equation in &thgr;, ⪚ <quote>r = &thgr;</quote>, or as a function, e.g. <quote>f(x) = x</quote>.</para></listitem>
<listitem><para>Polar plots are also similar to Cartesian plots. They can be either be entered as an equation in &thgr;, ⪚ <quote>r = &thgr;</quote>, or as a function, ⪚
<quote>f(x) = x</quote>.</para></listitem>
<listitem><para>For implicit plots, the name of the function is entered separetely from the expression relating the x and y coordinates. If the x and y variables are specified via the function name (by entering ⪚<quote>f(a,b)</quote> as the function name), then these variables will be used. Otherwise, the letters x and y will be used for the variables.</para></listitem>
<listitem><para>Explicit differential plots are differential equations whereby the highest derivatve is given in terms of the lower derivatives. Differentiation is denoted by a prime ('). In function form, the equation will look like <quote>f''(x) = f' − f</quote>. In equation form, it will look like <quote>y'' = y' − y</quote>. Note that in both cases, the <quote>(x)</quote> part is not added to the lower order differential terms (so you would enter <quote>f'(x) = −f</quote> and not <quote>f'(x) = −f(x)</quote>).</para></listitem>
