$1-\frac{1}{2}\cdot\left(2x-3\sqrt{x}\right)\cdot\left(2x+3\sqrt{x}\right)-2\left(\frac{2}{3}-x\right)$
$\left\{-2-7\right\}2$
$-3+\left|3\right|$
$-16\:-\:\left[-13\:-\:\left(25\:-\:37\right)\:+\:\left(34\:+\:32\right)\right]\:-\:\left[-26\:-\:\left(45\:-57\right)\right]\:\:$
$\left|-4\right|-\left|3\right|$
$2\:x\:12$
$\frac{\csc\:^2\left(a\right)+1}{\csc\left(a\right)-1}=\csc\left(a\right)+1$
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