4. (i) Let f be integrable on [a, b] . For x ∈[a, b] , let 
. Prove that F' x=f( x) whenever f is continuous at x .
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4. (i) Let f be integrable on [a, b] . For x ∈[a, b] , let . Prove that F' x=f( x) whenever f is continuous at x .