f_1(x) = ℯ^(x)
f_2(x) = ln((4 * x) + 7)
g_{11} = TaylorSeries(f_1, 1, 4)
g_{12} = TaylorSeries(f_1, 0, 3)
g_2 = TaylorSeries(f_2, 0, 3)