\left. \begin{array} { l } { - a ^ { 3 } b ^ { 3 } + 2 a ^ { 2 } b ^ { 3 } - a b ^ { 3 } } \\ { 3 a x ^ { 2 } + 6 a x y + 3 a y ^ { 2 } } \\ { a ^ { 4 } - 81 } \\ { ( y ^ { 2 } + x ^ { 2 } ) ^ { 2 } - 4 x ^ { 2 } y ^ { 2 } } \\ { 6 a ( a - b ) ^ { 2 } + 3 ( b - a ) ^ { 3 } } \end{array} \right.
Evaluate
-a\left(1-a\right)^{2}b^{3},\ 3a\left(x+y\right)^{2},\ a^{4}-81,\ \left(y^{2}-x^{2}\right)^{2},\ 3\left(a+b\right)\left(a-b\right)^{2}
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