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Which statements below are true?
a) There exists a continuous function f:R→Rf:\mathbb{R} \rightarrow \mathbb{R}f:R→R such that it is not differentiable at any point.
b) If a complex-valued function f:C→Cf:\mathbb{C} \rightarrow \mathbb{C}f:C→C has a first derivative, then it is infinitely derivative.
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