c =

u(x) =

u(x) = sin(x)
u1(x) = u'(x)
c: 2
f(x) = (c * u(x))
f1(x) = f'(x)
Eingabefeld1 = Textfield(c)
Eingabefeld2 = Textfield(u)
Text2: "u'(x) = " + (LaTeX[u1]) + ""
Text3: "f(x) = (\textcolor{green}{c} \cdot \textcolor{blue}{u})(x) = 
[\textcolor{green}{" + (LaTeX[c]) + "}] \cdot [\textcolor{blue}{" + (LaTeX[u]) + "}] = " + (LaTeX[f]) + ""
Text4: "f'(x) = (\textcolor{green}{c} \cdot \textcolor{blue}{u})'(x) = 
[\textcolor{green}{" + (LaTeX[c]) + " }] \cdot [\textcolor{blue}{ " + (LaTeX[u1]) + "}] = " + (LaTeX[f1]) + ""