simplify (2a+3b)²-(2a-3b) please
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(2a+3b)²-(2a-3b)
(2a-3b)
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(a-b)^2 = a^2 -2ab +b^2
(2a - 3b) {}^{2} \\ (2a) {}^{2} - 2 \times 2a \times 3b + (3b) {}^{2} \\ 4a {}^{2} - 12ab + 9b {}^{2}
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