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(i) Let f: JR be a real function defined on the non-empty open interval JC R. Give the definition for f to be differentiable

(i) Let f: JR be a real function defined on the non-empty open interval JC R. Give the definition for f to be differentiable at a point a J. (ii) Let f,g: JR be differentiable at a point a E J. State and prove the product rule for the derivative of the function fg.

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