$\ln\left(\cot\left(0\right)\right)$
$\left(-a^3b^4c\right)\cdot\left(-1c\right)$
$\int ysenhydy$
$\int\frac{5}{z^2}\:dz$
$\lim_{x\to0}\left(1-x^2sin\left(\frac{1}{x}\right)\right)$
$2x^2-4x+20-x^2+2xy+y^2$
$x^2-5x^2+6$
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