$ac-ad+bc-bd$
$\lim_{x\to0}\left(\frac{e^{2x+1}-e^{1-x}}{2x}\right)$
$\left(x^2+2y\right)\left(x-6y\right)$
$=\frac{6}{t}-\frac{81}{5}$
$15.6+\left(-19.2\right)$
$x^2-26x+1$
$15y^3-9y^2$
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