This simulation shows the geometric interpretation of the partial derivatives of [i]f[/i]([i]x,y[/i]) at point A in [math]\mathbb{R}^2[/math]. It also shows the tangent plane at that point.[br][br]Things to try:                [list][*]Drag the point A in the xy-plane or type specific values on the boxes.              [/*][*]Select the object you want to show: Tangent plane, f[sub]x[/sub] or f[sub]y[/sub].           [/*][*]Use right click and drag the mouse to rotate the 3D view or click on View button.[/*][/list]