$\textcolor{3333CC}{f(x,y)=}$

f(x, y) = sin((x * y)) + sin(x) + cos(y)
f'_{y} = Derivative(f, y)
P = PointIn(xOyPlane)
f'_{x} = Derivative(f, x)
F: P + (0, 0, f(P))
nabla_{f}: {{f'_{x}(P), f'_{y}(P)}}
Eingabefeld1 = Textfield(f)
P_{grad} = PointList(nabla_{f})
v_{grad} = Vector(P, P + Element[P_{grad}, 1])
g = Segment(P, F)
textDeriative: "\text{grad }f(" + (LaTeX[x(P)]) + "," + (LaTeX[y(P)]) + ")=(" + (LaTeX[Element[x(P_{grad}), 1]]) + "," + (LaTeX[Element[y(P_{grad}), 1]]) + ")"
textGrad: "\text{grad }f(x,y) = (" + (LaTeX[f'_{x}]) + " , " + (LaTeX[f'_{y}]) + ")"