Kontrollkästchen

a_2 = false
x_1 = -5 (slider from -5 to 5, step 0.1)
f(x) = (x - x_1)^(2.0)
x_2 = -4.1 (slider from -5 to 5, step 0.1)
x_3 = -3.2 (slider from -5 to 5, step 0.1)
g(x) = (x - x_2)^(2.0)
l(x) = (x - x_3)^(2.0)