Simplify
(3x+4y)³-(3x-4y)³-216×2y
please answer
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Step-by-step explanation:
(3x+4y)3 -(3x-4y)3 -216+2y
9x3 +12y3 - (3x-4y)3 -216x2y
9x3 +12y3 -9x3+12y3-216+2y
9x3-9x3 +12y3+12y3+2y-216
+24y3+2y-216
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