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$\frac{1}{1 + i}$ জটিল মূল বিশিষ্ট দ্বিঘাত সমীকরণ কোনটি?

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

x^{2} + 1 = 0

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

4 x^{2} - 4 x + 1 = 0

ANS : 3

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