$\left(5a+3b\right)\:\left(3a-b\right)$
$\left(\frac{x^2}{9}-\frac{1}{x^2}\right)^4$
$\left(2x-3\right)^2-\left(x+2\right)^2-3\left(x-6\right)$
$( 2 x - 3 x y ) ( 4 x ^ { 2 } + 6 x ^ { 2 } y + 9 x ^ { 2 } y ^ { 2 } )$
$a+a^2$
$y^4+1+2y^2$
$8\frac{2}{5}x^2y-3\frac{1}{4}x^2y$
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