(3a-1/2)(3a-1/2) using identity 2
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(a-b)^2= a^2-2ab+b^2
(3a-1/2)^2=3a^2-2×3a×1/2+1/2^2
= 9a^2-3a+1/4
(3a-1/2)^2=3a^2-2×3a×1/2+1/2^2
= 9a^2-3a+1/4
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