$\lim_{x\to0}\left(\frac{28}{x}-\frac{28}{e^x-1}\right)$
$\lim_{x\to\infty}\left(1-\frac{1}{3x}\right)^x$
$100^{t^2-0.5t}$
$9 a = 81$
$\int\left(x^2+5x\right)\cos\left(x\right)dx$
$8\left(5m-4\right)-8$
$4x^2+-8y+-3xy+5x^2+2xy$
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