(ক) (a2+2a+2)(a2+2a-2)
(খ) (a2+2a+2)(a2-2a+2)
(গ) (a2-2a+2)(a2+2a-2)
(ঘ) (a2-2a-2)(a2+2a-2)
উত্তর : (খ) (a2+2a+2)(a2-2a+2)
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(ক) (a2+2a+2)(a2+2a-2)
(খ) (a2+2a+2)(a2-2a+2)
(গ) (a2-2a+2)(a2+2a-2)
(ঘ) (a2-2a-2)(a2+2a-2)
উত্তর : (খ) (a2+2a+2)(a2-2a+2)