(2а-3) * (2а+3) * (4а2 + 9) - (4а2 - 9)2
(4a^2-9)*(8a+9)-(8a-9)*2
32a^3+36a^2 -72a-81-(16a-18)
32a^3+36a^2 -72a-81-16a+18
32a^3+36a^2-88a-63
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(2а-3) * (2а+3) * (4а2 + 9) - (4а2 - 9)2
(4a^2-9)*(8a+9)-(8a-9)*2
32a^3+36a^2 -72a-81-(16a-18)
32a^3+36a^2 -72a-81-16a+18
32a^3+36a^2-88a-63