$\lim_{x\to0}\left(\frac{x}{ctg\left(x\right)}\right)$
$7x-18=-2x$
$2x+6<8$
$\left(-19\right)-\left(-15\right)-\left(-11\right)$
$\left(3x^{\left(2\right)}-4\right)\left(3x^{\left(2\right)}+2\right)$
$d x - x d y = 0$
$\left(\frac{h^6}{mn^9}\right)^3$
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