$ln0$
$\left(2x^2y^3z-1\right)\left(2x^2y^3z+1\right)$
$144y^2-16^2$
$\left(2x^2+3x-1\right)\left(x+2\right)$
$\sec\left(x\right)\tan\left(^2\right)x+\sec\left(x\right)$
$\frac{-3-5}{4}$
$9x^2-4y^2$
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