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1/2+1/2. A3+a2-a1/a2+2a+1. 1+2a-1/a2-2a+1-a/a-1. 1+2 +2 +2 =2-1.
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1/2+1/2. A3+a2-a1/a2+2a+1. 1+2a-1/a2-2a+1-a/a-1. 1+2 +2 +2 =2-1. 