Unless otherwise specified, the domain of a function f is assumed to be the set of all real numbers x for which f (x) is a real number. * - cos () for 0

(a)   Find  W′(8). Using correct units, explain the meaning of W′(8) in the context of the problem.

(b)   The graph of  W is concave down for 3≤t≤3.5. Use the line tangent to the graph of W at t=3 to show that W(3.5)≤9. Minute Minute 

(c)   Find lim t→2

(W(t)−t^3+(1/4)) / (t−2)