Let f be the function defined by f (x) = cos(/x). OS sin() (c) It is known that f' (x) = cos() and f" (æ) = sin(a) Would a trapezoidal sum 4x approximation for | f(x) dx overestimate or •3 underestimate the value of f (x) dæ ? Give a reason for your answer. 3 (d) Write | f(x) dx as the limit of a right Riemann sum with n subintervals of equal length.

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