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how to solve this question, showing the working and clear writing 7. Let f : R - R be defined by 202 if a E

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how to solve this question, showing the working and clear writing

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7. Let f : R - R be defined by 202 if a E Q, f (a ) := 0. if x & Q (i) Prove that f is continuous at x = 0, using the E-6 definition of continuity. (ii) Prove that f is differentiable at x = 0

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