माना f : N to R , f (x) = 4x^(2) + 12x +...

माना f : N `to R , f (x) = 4x^(2) + 12x + 15` व्दारा परिभाषित एक फलन हैं । सिद्ध कीजिए कि f : N`to`S , जहाँ S , जहाँ S , f का परिसर हैं , व्युत्क्रमणीय हैं । f का प्रतिलोम भी ज्ञात कीजिए ।

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