$\left(a-2bc\right)^2$
$\left(3z^3\:4z\:\:z^2\right)^2$
$-\left\{3\left[-4+30-2+6\right]-3\right\}$
$\frac{1-\frac{sin^\theta}{cos^\theta}}{1+\frac{sin^\theta}{cos^\theta}}$
$\csc\left(\theta\right)cos^2\left(\theta\right)tan^2\left(\theta\right)$
$\sec^2a-2=0$
$81p^2\:+\:144p\:+\:64$
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