$x^2-50x+225$
$3x-4y+x$
$-78+\left(-2\right)\cdot\left(56\right)$
$\int\:\frac{t^2-t^3-t-1}{t^3-t^2}dt$
$3-sec^2x$
$\lim_{x\to-2}\left(\frac{\sqrt{x+5}-\sqrt{3}}{x+2}\right)$
$25y+12y-31y-8y+5y$
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