$-1+4-1+4+2-3$
$a\cdot b\cdot c+a\cdot b\cdot d+a\cdot b\cdot c\cdot d$
$3\cot\left(x\right)-1=0$
$\int\left(\frac{x^2}{\left(1+x^2\right)^2}\:\right)dx$
$\lim_{x\to1}\left(8\cos\left(x\right)\right)$
$\left(-1\right).\left(+14\right).\left(-5\right)$
$-a^2+10a+25$
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