$r^2-16r+63$
$2x^4-3x^2-20$
$\sin^2\left(x\right)+6\cos\left(x\right)+15$
$\lim_{x\to-\infty}\left(\frac{5x^2-2x+1}{x^2+72x+140}\right)$
$3xy-2xyz^2$
$\lim_{x\to0}\left(4\ln\left(3+x\right)-\frac{1}{3}\sin\left(4x\right)\right)$
$\int2^{3x}\:dx$
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