Factorization (2a-b) ^ 2 - (a, b) (a-b), please | Math enthusiast | Mathematical art

Factorization (2a-b) ^ 2 - (a, b) (a-b), please

The original formula = 4A & # 178; - 4AB + B & # 178; - A & # 178; + B & # 178;
=3a²-4ab+2b²
This can't be broken down

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