Define the variables a, b, c, and d as: a = 12, b = 5.6, c = 3a/b^2, and d = (a - b)^c/c, then evaluate: (a) a/b + d - c/d + c - (d - b)^2 (b) d - c/e^a - 2b + ln (|c - d + b/a|)