[b]f(x, y) = 3 (1 - x²) ℯ[sup]-(x - 0.5)² - (y + 1)²[/sup] - 2 (x / 5 - x³ - y⁵) ℯ[sup]-x² - y²[/sup] sin(x - y)[/b][br][size=85][br][b]*Detailed instructions and explanations for this applet can be found in the previous applets [url=https://www.geogebra.org/m/yf62eg4c]1[/url], [url=https://www.geogebra.org/m/v6pwykyh]2[/url] and [url=https://www.geogebra.org/m/djtadvjc]3[/url].[/b][/size]