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\frac{1}{1 + i}

হলে দ্বিঘাত সমীকরণটি-

x^{2} - x + 1 = 0

x^{2} + x + 1 = 0

2 x^{2} - 2 x + 1 = 0

2 x^{2} + 2 x + 1 = 0

ANS : 3

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