$4=\frac{2}{7}x$
$y=\frac{x-5}{x^2-25}$
$\frac{-20a^2b^2}{8ab}$
$\frac{dy}{dx}y^2=x+2$
$\lim_{x\to0}\left(\cos\left(2x\right).\sin\left(6x\right)\right)$
$\lim_{x\to0}\left(\frac{\left(6x\right)^n}{\left(n+8\right)\left(n+9\right)}\right)$
$3xy+6xz+12xw$
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