Consider the following.f(x) = 4/(x - 1), a = 2
(a) Compute the difference quotient f(a + h) - f(a)/ h at the given value of a.
(b) Compute mtan = lim h→0 f(a + h) - f(a)/ h
(c) Use the result of part (b) to find an equation of the tangent line at the point of tangency.