In Exercises (a) Use a computer algebra system to differentiate the function (b) Sketch the graphs of and ' on the same set of

In Exercises 

(a) Use a computer algebra system to
differentiate the function

(b) Sketch the graphs of ƒ and ƒ' on
the same set of coordinate axes over the given interval

(c) Find the critical numbers of ƒ in the open interval, and 

(d) Find the
interval(s) on which ƒ' is positive and the interval(s) on which it
is negative. Compare the behavior of ƒ and the sign of ƒ'.

f(x) = 2x9 - x, [-3,3]