Using an integral to calculate a sum over f (n) (where n is an integer) is a good approximation when
A. the summed values f (n) are individually small.
B. the value of f (n) varies only very slowly with n.
C. the value of f (n) goes to zero as n goes to infinity.
D. the value of f (n) goes to zero as n goes to zero.
E. All of the conditions above are true.
B. the value of f (n) varies only very slowly with n.
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