$\lim_{x\to2}\left(9-4x\right)^{\frac{1}{tg\left(x-2\right)}}$
$\left(3-\left(-8\right)\right)+\left(-2\right)$
$\int\left(9t+1\right)^{2.7}dt$
$\frac{x-1}{x+5}-2\ge0$
$\left(x+5\right)^2=2x^2-7$
$\left(a\:+q\right)\left(a-q\right)$
$252\:.\:6$
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