$\lim_{x\to0}\left(\frac{\ln\left(\sin\left(6x\right)\right)}{\ln\left(\sin\left(x\right)\right)}\right)$
$\left(2c^2+\:d^2\right)^2$
$\frac{x^3y^6-512}{xy^2-8}$
$x^2+y^2;x=2;y=5$
$\frac{dy}{dx}\left(y=x\tan^{-1}\left(2x\right)\right)$
$x+3\sqrt{x}-4=0$
$\frac{a^2\left(4-9b^2\right)}{36}$
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