The Screen Shown Here Gives the Graph Of $\frac{x^{2}}{9}+\frac{y^{2}}{36}=1$ As Generated by a Graphing Calculator

Short Answer

The screen shown here gives the graph of $\frac{x^{2}}{9}+\frac{y^{2}}{36}=1$ as generated by a graphing calculator.
What two functions were used to obtain the graph?