88. (a) Write | x | − sx 2 and use the Chain Rule to show that

Question

d
dx | x | − x| x |
(b) If fsxd − | sin x |, fnd f9sxd and sketch the graphs of f
and f9. Where is f not differentiable?
(c) If tsxd − sin | x |, fnd t9sxd and sketch the graphs of t
and t9. Where is t not differentiable?