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$a^{6} + b^{6}$ এর একটি উৎপাদক কত?

(a^{2} + b^{2})^{3}

(a^{2} - b^{2})^{2}

a^{4} + a^{2} b^{2} + b^{4}

a^{4} - a^{2} b^{2} + b^{4}

ANS : 4

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