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Let f(x), xge0, be a non-negative contin...

Let `f(x), xge0`, be a non-negative continous function,and let `F(x) = int_(0)^(x)f(t)dt, xge0`, if for some `cgt0,f(x)lec F(x)` for all `xge0`, then show that `f(x)=0` for all `xge0`.

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