প্রশ্নঃ
যদি √x + 1/√x = a হয়, তবে x2 + 1/x2 এর মান কত?
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ক.
a4 - 2a2 + 2
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খ.
a4 + 4a2 + 2
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গ.
a4 - 4a2 - 2
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ঘ.
a4 - 4a2 + 2
উত্তরঃ ঘ
 a4 - 2a2 + 2 খ) a4 + 4a2 + 2 গ) a4 - 4a2 - 2 ঘ) a4 - 4a2 + 2 উত্তর: ঘ) a4 - 4a2 + 2
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