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[" Let "f(x)=(1)/(sqrt(18-x^(2)))" ,then...

[" Let "f(x)=(1)/(sqrt(18-x^(2)))" ,then the value of "lim_(x rarr0)(f(x)-f(3))/(x-3)" is "],[[" (A) "0," (B) "-1/9," (C) "-1]]

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