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(a + b)² = a² + 2ab + b²
(2+3x)²
4 + 12x + 9x²
(2ab+3a)²
4a²b² + 12a²b + 9a²
(2a-b)²
4a² - 4ab + b²
(2xyz-a)²
4x²y²z² - 4axyz + a²