Code:
$ xG(x)=x\int_{x}^{\infty}|f(t)|dt\le\int_{x}^{\infty}t|f(t)|dt. $
Code:
$ xG(x)=x\int_{x}^{\infty}|f(t)|dt\le\int_{x}^{\infty}t|f(t)|dt. $
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