Assume that and g are differentiable on [a, b] and that (a) = g(a) and (b)

Assume that ƒ and g are differentiable on [a, b] and that ƒ(a) = g(a) and ƒ(b) = g(b). Show that there is at least one point between a and b where the tangents to the graphs of ƒ and g are parallel or the same line. Illustrate with a sketch.