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= (2a)² + 2.2a.6b + (6b)²
= 4a² + 24ab + 36b²
2) (3x-5y)²
= (3x)² + 2.3x.(-5y) + (-5y)²
= 9x² - 30xy + 25y²
= 4a^2+2ab+2ab+36b^2
= 4a^2 + 24 ab + 36b^2
no 2menyusul