$2x^2+4x-16=0$
$\left(x+ax+1-x\right)\left(x+ax+1+x\right)$
$k2\:-\:12k\:+\:36$
$a^6.\:a^8$
$\int\frac{1}{\left(x+7\right)^2}dx$
$\left(a-16+b\right)\left(a+16-b\right)$
$\left(\csc\left(x\right)-\sin\left(x\right)\right)\left(\sec^2\left(x\right)+1\right)$
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