$-\:\left[-1\:-\:4\:-\:5\left(-1\:-\:2\right)\:+\:8\:\right]$
$\left(4x-2-x+2\right)$
$\frac{cos2\left(x\right)}{1-\sin\left(x\right)}=1\:+\:sin\left(x\right)$
$25t^2-25t+6$
$\left(19z\right)^0$
$5y=7-3x$
$\tan^2\left(x\right)=2.6$
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