c = 0 (slider from -5 to 5, step 0.1)
a = 1 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
f(x, y) = (a * x^(2)) + (b * y^(2)) + ((c * x) * y)
Text1 = LaTeX(f, true, true)