$\lim_{x\to0}\left(\frac{e^{3x}-1}{x-cos\left(x\right)+e^{-x}}\right)$
$\int\frac{x^2-9x+1}{x^2+x}dx$
$8m-12=-15m^2$
$\int\left(3x+6\right)^2dx$
$\frac{1}{3}+b=\frac{4}{3}$
$\frac{3}{2a-4}+\frac{1}{a^2-4}$
$x^2+101x+100$
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