$5+8\left\{1-5\left(6^2-7\right)\right\}$
$3^{-9}\cdot3^6\cdot3^6$
$\lim_{x\to-\infty}\left(x+\sqrt{-x}\right)$
$\int\left(\frac{2x+5}{\left(x-3\right)\left(x^2-9\right)}\right)dx$
$\sqrt{28x^2}$
$\left\{3x-7y-8z=-8\right\}$
$\int\sin\left(10x+2\right)dx$
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