f(x) = 2 - (1 / 4 * x^(2))
g(x) = (1 / 2 * x) + 3
eq1: x = 0
eq2: x = 2
a = IntegralBetween(g, f, 0, 2)
h(x) = (1 / 12 * x^(3)) + (1 / 4 * x^(2)) + x