Find the area of the region between the following graphs if possible:
1. f(x) = x^2 - 4x + 3 and g(x) = -x^2 + 2x + 3
2. f(x) = x^2 + 2x + 1 and g(x) = 3x + 3
3. f(x) = x, y = 2 - x, y = 0
4. Find the area of the region bounded by the graph of f(x) = x^3 and the tangent line to the graph at the point (1, 1).