$\frac{4x^3-6x^2+2x-9}{\left(2x\right)-1}$
$\int\cot^4\left(3x\right)\cdot\csc^2\left(3x\right)$
$15+3\cdot2$
$1-2x^3+4$
$25x^2+50y^2+5x-25$
$m^2-4m+2$
$\left(ab+1\right)^2.\:\left(ba-2\right)$
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