I. (a) Find the derivative y' of the function y = tanx + (x2 + x-6)( x+5) + (2x3 + x) / ( x+3) (b) Find the derivative dy/dx of the function y in the implicit relation: x3-3y2 + 107 = 0 2. Evaluate the derivative y' of the function y = (x+5) / (3x+21) at the following points on its graph: (a) Point P (x-5) (b) Point Q (x=-5) (c) Point R (x 7) (d) Can we evaluate the derivative y' at the value x-7? Why? (d) Can we evaluate the derivative y' at the value x--7? Why?