18. The graph of the derivative of a certain function f appears below. Graph of f' G3.3 465 0 -S (b) (a) Suppose f(1) = 5. Find an equation of the

19-)Use Newton's Method to approximate the root of cos 2 x x   to four decimal places. 

18.The graph of the derivative of a certain function f appears below.Graph of f'G3.3 465 0-S(b)(a) Suppose f(1) = 5. Find an equation of the line tangent to the graph of f at (1, 5).Suppose f(-1) = -2. Could f(3) = -6? Why or why not?(c)Estimate f"(-3).d) At which values of x does f(x) have points of inflection?(eAt which value of x in the interval [-4, 5] does f(x) achieve its largest value? Its smallestvalue?