$x^3+12x^2+21x+10$
$3k^2\:.\:4k^3$
$\left(y^2-3xy-2x^2\right)dx=\left(x^2-xy\right)dy$
$\frac{\left(secx\right)\left(tanx\right)}{1+tan^2x}$
$\frac{2x^2+11x-16}{x+7}$
$\left(7x^2+3x+9\right)+\left(2x^2+5x-2\right)$
$\left(x+1\right)\left(x-2\right)\left(5x-2\right)\left(x+3\right)$
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