u(x) =

v(x) =

u(x) = sin(x)
Eingabefeld1 = Textfield(u)
u1(x) = u'(x)
v(x) = cos(x)
Eingabefeld2 = Textfield(v)
v1(x) = v'(x)
f(x) = u(x) + v(x)
f1(x) = f'(x)
Text1: "u'(x) = " + (LaTeX[u1]) + ""
Text2: "v'(x) = " + (LaTeX[v1]) + ""
Text3: "f(x) = (\textcolor{blue}{u} + \textcolor{red}{v})(x) = 
[\textcolor{blue}{" + (LaTeX[u]) + "}] + [\textcolor{red}{" + (LaTeX[v]) + "}] = " + (LaTeX[f]) + ""
Text4: "f'(x) = (\textcolor{blue}{u} + \textcolor{red}{v})'(x) =  
[\textcolor{blue}{" + (LaTeX[u1]) + " }] + [\textcolor{red}{ " + (LaTeX[v1]) + "}] = " + (LaTeX[f1]) + ""