$\lim_{x\to3}\left(\frac{1-2x}{2x-6}\right)$
$\tan^2\left(x\right)+3\tan\left(x\right)$
$x^4+x-2$
$2b^2-6b+4$
$\sqrt[7]{10^{14}}$
$\int\frac{x^2+x-1}{x^3-x^2-x+1}dx$
$5x-3^2$
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