$\left\{\left(2\cdot3\right)^2\right\}^0$
$4\:+\:100m^2$
$-6x+3y=36$
$-4x+1=21$
$\left(6x\right)\left(4x-1\right)$
$\left(\sin a+\csc a\right)^2+3$
$cot\left(x\right)\cdot cot\left(y\right)+1$
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