$\sec\left(z\right)\cdot\csc\left(z\right)$
$6x^2n+12x^3n^2-x^4n^3$
$\left(\frac{128xy^{-6}z^6}{2x^{-3}yz}\right)^{\frac{1}{3}}$
$7x^2+x>2x-6$
$+\left(-4+5-6\right)-\left(+7-3+6\right)-5$
$16b^2-48b+36$
$\left(x+1\right)-\left(x-1\right)^2$
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