$9x^2-12x+225$
$\frac{x^2+5x+6}{x+3}$
$4x^2y-25y$
$\left(3x-4\right)\left(3x+4\right)+\left(3x-4\right)^2$
$\left(3a+b\right)\left(2a+4b\right)$
$x^4-xy$
$\left(1+\cot\left(x\right)-\csc\left(x\right)\right)\left(1+\tan\left(x\right)+\sec\left(x\right)\right)$
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