Please all parts of Question 2 and, if possible 3 or 4. If you are able to answer 3 or 4-I will gladly give a thumbs up. Thank you

2. For the function f(x) = x2-6x-7 Compute the following limits: x2 -4x-21 (a) lim f(x) x-+00 (b) lim f(x) x- -3+ (c) lim f(x) x->-3 (d) lim f(x) x--3 3. Find the Vertical Asymptotes of f (x) = sin(x) ' 4. Use limits to find all Horizontal Asymptotes of g(x) = arctan(x). (A graph will be very useful)