$\lim_{x\to0}\left(\frac{sin\left(x\right)}{e^{3x}}\right)$
$\left(2a\:+9b\right)^3$
$x\left(x+4\right)^2$
$3xy-5xy+xy$
$-7\left(-7\right)^{-4}$
$.8+\left(-10\right)$
$a^2-8a+64$
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