Question 4 Determine the following limit lim VI +6r + 29 + 1 1 point I-+-00 if it exists. Enter 'NA' (without the quotation marks) if limit does not exist. Answer : Question 5 Determine the following limit cos (21) lim 1 point 1 1 28 (cos (x) - sin()) if it exists. Enter 'NA' (without the quotation marks) if limit does not exist. Answer : Question 6 f(I) If lim -+0 = 10, find the limit lim-0 I f(I) 1 point Answer : Question 7 Suppose f(x) = ar + band limz-+9 f(I) VI-3 1. Find a and b. 1 point Answer : b=