-I if I 52. [4 points each] Evaluate the following limits, if they exist. (a) lim 73 - 3r +4 P-14 272 - r - 1 (b) lim T-T'- I+10 T- + 31 + 2 (c) lim J+1 Va - 1\f7. [4 points each] Find the indicated derivative. A+ BL+ 012 (a) De where A, B and C are constants, (b) Deltan 2r secr + tan(2 secr) ] 12 - 1 (c) where y = 2110. [5 points] (Solve the World Problem). Two people standing 10 m apart. One remain stationary while the other walks north. The angle between them changes at a rate of 2 rad / s. How fast is the distance between them changing if the angle between them is 60"