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यदि alpha, beta द्विघात बहुपद ...

यदि ` alpha, beta ` द्विघात बहुपद ` f (x) = x ^ 2 - x - 4 ` के शून्यक हो, तो ` (1) /(alpha ) + ( 1) /( beta ) - alpha beta ` का मान ज्ञात कीजिए |

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