1 =+* Given f(x)=- (a) Use the definition of the derivative to find f'(x). (b) Use f'(x) to find the slope of the tangent line to the graph of fat P(1/4, 2). (c) Draw the graph off and the tangent line at P. Use the graph off to do the following. (a) Find the values of x in (0, 6) at which fis not continuous. (b) Find the values of x in (0, 6) at which fis not differentiable. (c) Sketch the graph of f'.