$\lim_{x\to0}\left(\frac{x^2-x-12}{x^2-3x-4}\right)$
$y^3\sin^2x=8$
$\frac{\left(a+b\right)^2-c^2}{a+b+c}$
$3x^2+27x+24$
$2x^2y^23y^23$
$8x^6+7x^3-1$
$\sec\left(x\right)\frac{dy}{dx}=\frac{-y^{11}}{10}$
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