$-9\:x\:25\:$
$49k^2-36$
$x-19=-33$
$\lim_{x\to0}\left(\frac{2x^2-3x}{\sin\left(x\right)}\right)$
$\left(a^7+b^7\right)\left(a+b\right)$
$\lim_{x\to0}1+\frac{x^2}{6}$
$\int\:\:\left(\frac{m^2+1}{m^2-m}\right)dm$
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