Images C2 4BC 4B2

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C2 4bc 4b2. A2+4ab+4b2. A 2-ab-4a+4b. 2a+b-4ab/2a+b. (A-B)^2=(B-A)^2.
A2+4ab+4b2. A 2-ab-4a+4b. 2a+b-4ab/2a+b. (A-B)^2=(B-A)^2.

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