a = 0.5 (slider from 0.5 to 10, step 0.5)
f(x) = x / a + a^(2) / x^(2)
g(x) = x + 1 / x^(2)
h(x) = x / 2 + 4 / x^(2)
p(x) = x / 3 + 9 / x^(2)