35-38 Produce graphs of f that reveal all the important aspects of the curve. Use graphs of f' and f" to estimate the intervals of increase and decrease, extreme values, intervals of concavity, and inflection points. In Exercise 35 use calculus to find these quantities exactly. 35. f(x) = x - 45. Show that the equation 3x + 2 cos x + 5 = 0 has exactly one real solution. 46. Suppose that f is continuous on [0, 4], f(0) = 1, and 2