$\left(-4\right)\cdot\left(-2\right)\cdot\left(2\right)\cdot\left(-7\right)$
$\left(8z-4\right)+\left(8z-4\right)$
$2\sec^2x-\sec^4x$
$\left(\:2\:t\:\:-\:\:3\:\right)\:\:\cdot\:\left(\:5t^2\:\:+\:\:3t\:\:-\:\:1\:\right)\:\:\:$
$\int e^{2x^3}dx$
$\lim_{x\to0}\left(\frac{28}{x}-\frac{28}{e^x-1}\right)$
$\frac{1}{2}\cdot0+1$
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