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If `f(x)` is a differentiable function such that `f\'(x)=7-(3)/(4)(f(x))/(x)`, `f(1)!=4`, then `lim_(xrarr0^+)x*f((1)/(x))` is equal to (a) does not exist (b) exist and equal to 4 (c) exist and is equal to `(4)/(7)` (d) exists and equal to 0

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