Simplify :
(2xy-3ab)³-(2xy+3ab)³
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(a-b)^3-(a+b)^3=a^3 -b ^3-3a^2 b+3ab^2
-(a^3+b^3+3a^2b+3ab^2)
=-2b^3-6a^2b
-2(3ab)^3-6(2 x y)^2(3ab)
-2(27)(ab)^3-84(xy)^2
-(a^3+b^3+3a^2b+3ab^2)
=-2b^3-6a^2b
-2(3ab)^3-6(2 x y)^2(3ab)
-2(27)(ab)^3-84(xy)^2
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