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Let f(x)be continuous on [a,b], differen...

Let f(x)be continuous on [a,b], differentiable in (a,b) `and f(x)ne0"for all"x in[a,b].` Then prove that there exists one `c in(a,b)"such that"(f'(c))/(f(c))=(1)/(a-c)+(1)/(b-c).`

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