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सिद्ध कीजिए कि f(x) = ।x। द्वारा प्रदत्...

सिद्ध कीजिए कि `f(x) = ।x। ` द्वारा प्रदत्त मापांक फलन `f: R to R` न तो एकैकी है और न आच्छादक है, जहाँ `।x।={{:(x,xge0),(-x,xlt0):}`

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