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Use the Definition of Derivative lim⁡z→cf(z)−f(c)z−c\lim _ { z \rightarrow c } \frac { f ( z ) - f ( c ) } { z - c }

Question 25

Essay

Use the definition of derivative: lim⁡z→cf(z)−f(c)z−c\lim _ { z \rightarrow c } \frac { f ( z ) - f ( c ) } { z - c } to find f′(−2), if f(x)=2xf ^ { \prime } ( - 2 ) \text {, if } f ( x ) = \frac { 2 } { x }

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