$\frac{90}{x^2+110x+1000}$
$\int\frac{\sqrt{1+x}+1}{\sqrt{1+x}-1}dx$
$9x^2-3x-2$
$2x\tan\left(y\right)dx+\sec\left(y\right)^2dy=0$
$\sin\left(\frac{\pi}{2}-x\right)=\cos x$
$3x^2-4x+8$
$\left(-x+3\right)\left(x-4\right)$
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