$\lim_{x\to0}\left(\frac{1-e^{-ix\pi}}{ix\pi}\right)$
$\left(-4b\right)\left(-6b\right)$
$b^4-25$
$2b^2+8$
$\frac{dx}{dt}=-2$
$-4y+y^2+5y$
$\sqrt{7}+7\sqrt{7}$
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