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[math]\displaystyle{ y=\sqrt{1-x^{2}} }[/math]
[math]\displaystyle{ \begin{matrix} \text{Using\ Polynomials\ as\ a\ Form-Fitting\ Tool.} \\ \\ \text{By\ Dirk\ Mittler,\ August\ 16,\ 2013} \\ \\ \text{As\ an\ example,\ a\ cubic\ (3rd-order)\ polynomial\ can\ be\ given\ as\ follows:} \\ \\ {f{{(x)}=\mathit{a1}}{x^{3} + \mathit{a2}}{x^{2} + \mathit{a3}}{x + \mathit{a4}}.} \\ \\ \text{This\ type\ of\ function\ can\ be\ made\ to\ give\ a\ list\ of\ 4\ values,\ for\ a\ list\ of\ 4\ known} \\ \text{parameters\ (x),\ through\ a\ careful\ choice\ of\ a1\ \ ...\ a4\ :} \\ \\ {\mathit{a1}{x_{1}^{3} + \mathit{a2}}{x_{1}^{2} + \mathit{a3}}{{x_{1} + \mathit{a4}}=f}{(x_{1})}.} \\ {\mathit{a1}{x_{2}^{3} + \mathit{a2}}{x_{2}^{2} + \mathit{a3}}{{x_{2} + \mathit{a4}}=f}{(x_{2})}.} \\ {\mathit{a1}{x_{3}^{3} + \mathit{a2}}{x_{3}^{2} + \mathit{a3}}{{x_{3} + \mathit{a4}}=f}{(x_{3})}.} \\ {\mathit{a1}{x_{4}^{3} + \mathit{a2}}{x_{4}^{2} + \mathit{a3}}{{x_{4} + \mathit{a4}}=f}{(x_{4})}.} \\ \\ \end{matrix} }[/math]
