[6 marks] 4. Verify that L' Hospital's rule can be used to evaluate the following limits. Then use it to evaluate them. (Note: no marks will be awarded if limits are calculated by any other method). (a) lim Vath- VI h-0 h 14 -13 - x+1 (b) lim 14+1 16 - 215 + 314 - 313 - x2 + 3x - 1 [5 marks] 5. f(x) is defined