21: A) If S(ƒ.p) is any Riemann sum of f(x):[a,b]→R. Show that there exist a step function :[a,b]→R , such that [9= S(f,p). (10pts) %3D

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Q: A) If S(f.p) is any Riemann sum of f(x):[a,b]-R. Show that there exist a step function o:(a,b]→R.…

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