$\lim_{x\to\infty}\left(\sqrt{x}-\sqrt{2x+7}\right)$
$v^2+10v-9=0$
$\lim_{x\to-3}\left(\frac{x-9}{x-3}\right)$
$6a^2+60a+150$
$\int_0^{\infty\:}b\left(w\right)sen\left(w\right)dw$
$\frac{3}{2x+17}=0$
$\int e^{15x}\left(15\right)dx$
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