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karana hanya pangkat 2 pakek manual aja
(2a-3b)(2a-3b)
4a^2 - 6ab - 6ab + 9b^2
4a^2 - 12ab + 9b^2
(2a x 2a) - (3b x 3b) = 4a² - 9b²
(kalau gak salah jawabannya itu)