$-9\left(z-99\right)=9$
$\tan^2\left(90-b\right)+1$
$\log\left(12x^2\right)-\log\left(2x\right)$
$\left\{63-\left(52+19\right)\right\}-\:\left(14-\left(139\right)\right)$
$\sqrt[3]{81x^{-12}}y^{16}$
$\int\frac{x^2}{\left(x-1\right)^3}dx$
$xt'=5x''t$
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