f(x) = cos(x)
g(x) = sin(x)
f_1(x) = (3 * cos((2 * x)))
f_2(x) = cos(x / 3)
g_1(x) = (2 * sin((3 * x)))
A = Intersect(g_1, xAxis, (2.0943951020636002, -1.977572373885194E-9))