a = 0.4 (slider from -5 to 5, step 0.1)
b = -0.4 (slider from -5 to 5, step 0.1)
h = 1.5 (slider from -5 to 5, step 0.1)
k = 0.6 (slider from -5 to 5, step 0.1)
f(x) = a * tan(b * (x - h)) + k
liste1 = Sequence(x = h + π / b * (1 / 2 + n), n, -10, 10)