CVD4

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Show that $\lim_{z\to 0} \frac{\cos z - 1}{z} = 0\,$

$\lim_{z\to 0} \frac{\cos z - 1}{z} = \lim_{z\to 0} \frac{\cos z - \cos 0}{z} = \cos'(0) = -\sin(0) = 0\,$

Main Page : Complex Variables : Differentiation

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