Photos C2 4BC 4B2

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C2 4bc 4b2. A2-b2. A2+2ab+b2. A^2+B^2=C^2. A2 b2 c2 2bc.
A2-b2. A2+2ab+b2. A^2+B^2=C^2. A2 b2 c2 2bc.

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