$4\cdot7-6$
$ydx+xdy=2dy$
$\lim_{x\to infinite}\left(\frac{ln\left(\frac{cos}{x}\right)}{x^{-2}}\right)$
$sin\left(a+x\right)$
$\int\:\frac{x^2}{\left(9-x^2\right)^3}dx$
$\frac{4n^4}{3n^3\:}\:$
$\frac{27z^9+y^{15}}{3y^3+x^5}$
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