A. \(f'\left( {{x_0}} \right) = \mathop {\lim }\limits_{\Delta x \to 0} \frac{{f\left( {{x_0} + \Delta x} \right) - f\left( {{x_0}} \right)}}{{\Delta x}}.\)
B. \(f'\left( {{x_0}} \right) = \mathop {\lim }\limits_{\Delta x \to {x_0}} \frac{{f\left( x \right) - f\left( {{x_0}} \right)}}{{x - {x_0}}}.\)
C. \(f'\left( {{x_0}} \right) = \mathop {\lim }\limits_{h \to 0} \frac{{f\left( {{x_0} + h} \right) - f\left( {{x_0}} \right)}}{h}.\)
D. \(f'\left( {{x_0}} \right) = \mathop {\lim }\limits_{x \to {x_0}} \frac{{f\left( {x + {x_0}} \right) - f\left( {{x_0}} \right)}}{{x - {x_0}}}.\)
D
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