Directional Derivative Visualizer

Syntax follows Mathematica Syntax
"Function f(x,y): "
Sin[xy]
"Point (xâ‚€, yâ‚€): ""xâ‚€ = "
1
", ""yâ‚€ = "
1
"Direction Angle θ (in radians): "
" θ = "
Ï€
4
"Show Options:"
" Surface "
" Curve "
" Tangent "
" Plane "
" Base Point "
" XY Direction Vector"