\left. \begin{array} { l } { a b ( x ^ { 2 } + y ^ { 2 } ) - x y ( a ^ { 2 } + b ^ { 2 } ) ( a x - b y ) ( b x - a y ) } \\ { 15 x ^ { 4 } + 3 x ^ { 2 } - 18 a ( a + 1 ) ( n - 1 ) ( 5 x ^ { 2 } + b ) } \end{array} \right.
Evaluate
-xy\left(a^{2}+b^{2}\right)\left(ax-by\right)\left(bx-ay\right)+ab\left(x^{2}+y^{2}\right),\ 3\left(-6a\left(n-1\right)\left(a+1\right)\left(5x^{2}+b\right)+5x^{4}+x^{2}\right)
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