$\:8r\:-\:3s\:-\:5r$
$\lim_{x\to1}\left(\frac{2-2x-\ln\left(x\right)}{2-3x+x^3}\right)$
$\int_0^{.2}\left(x\:\left(ln\left(1+x^2\right)\right)\right)dx$
$-22.4+18.9$
$\frac{\left(2^n+4^n\right)}{6^n}$
$9xy^3-729x^3y$
$\int\left(6ye^{2y^2}\right)dy$
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