f(x) = 1 / x
g(x) = -1 / x
h(x) = 0.8^(x)
p(x) = -0.8^(x)
r(x) = 0.1 * x^(2) + 1
s(x) = -0.1 * x^(2) - 1
q(x) = r(x) * sin(x)