expand (1/2a-1/3+1)^2
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(1/2a) ^2- (1/3)^2+(1)^2+2(1/2a ×(- 1/3)+(-1/3×1)+(1)×1/2a
1/4a^2-1/9+1+2(-1/6a-1/3+1/2a
1/4a^2-1/9+1+2(-1/6a-1/3+1/2a
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