$\int\left(\cos\left(x\right)\cot\left(x\right)\right)dx$
$30+20+50+100+12$
$\left(t+4\right)\left(t+7\right)$
$14^{-2}\cdot14^2$
$\left(169z^2-16y^2\right)+\left(13z-4y\right)$
$\frac { x ^ { 2 } + x - 6 } { x + 3 } = x - 2$
$\int\left(\frac{\left(x-x^3\right)}{x^4-2x^2}\right)dx$
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