$x^2-8.x+16=\:$
$\frac{x^2+9x+18}{x+6}$
$\frac{2^{15}}{2^3x\:2^5}$
$-\left|-18\right|$
$\csc\left(x\right)\sin\left(2x\right)-\sec\left(x\right)\cos\left(2x\right)=\sec\left(x\right)$
$\left(6+12m^2\right)\left(6-m^2\right)$
$\int x^2\frac{\left(x^2-1\right)}{\left(x^2+1\right)}dx$
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