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Let for a differentiable function f:(0,o...

Let for a differentiable function `f:(0,oo)rarr R,f(x)-f(y) ge log_(e)((x)/(y))+x-y,AA x,y in(0,oo)`
Then `sum_(n=1)^(20)f'((1)/(n^(2)))` is equal to

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