$40m^9-40m^5-28m^3$
$10\left(-3\right)\left(27\right)$
$x^2y\:+\:2xy\:=\:ln\left(x\right)\:$
$\left(-11\right)\left\{15+\left(-16\right)\right\}\left\{\left(-14\right)-\left(-11\right)\right\}$
$\lim_{x\to\infty}\left(x\cdot tan\left(\frac{180}{x}\right)\right)$
$9x^2-20x-21=0$
$x^2-\:x+1\ge0$
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