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यदि f(x)={(xe^(-[1/(|x|)+1/x]),,x ne 0),...

यदि `f(x)={(xe^(-[1/(|x|)+1/x]),,x ne 0),(0,,x=0):}` तो सिद्ध कीजिए की फलन `f(x)` बिंदु `x=0` पर अवकलनीय नहीं है।

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