3. Using only the definition of the limit of a function at a point, prove that lim - Thus you are being asked to prove that lime-a f(r) = L where f (x) = 1/x, a = 2 and L = 1/2. (a) Relate If(x) - L| to |x - a in this case. (b) Show why it follows that If (x) - L| 0 what choice of o will guarantee that If (x) - L|