For questions 1-5, find the limit. 2 + x 2 x csc x + 1 1. lim (x3 - 2x2 + 1) 2. lim V1 - 2x 3. lim 4. lim X X CSC X 1 - - 2 X-0 sin 2x lin 4.X . lim |x+7 5. x 7-7 x +7 In Exercises 15-20, determine whether the limit exists on the basis of the graph of y = f(x). The domain of f is the set of real numbers. 15. lim f(x) 16. lim f(x) 17. lim f(x) 18. lim f(x) 19. lim f(x) 20. lim f(x) y = f() b c d 1 . - X . - 1