$\int_0^7\left(te^{-t}\right)dt$
$x^2+2x-3;\:x=-2$
$54h^2i^3j^4-60h^3i^4j^5+48hi^2j$
$\int\left(\frac{2sen\:x}{5}\right)dx$
$\frac{m^4}{m^1}$
$25\:-\:2x\left(2\right)$
$\lim_{x\to9}\left(\frac{3-\sqrt{x}}{81-x^2}\right)$
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