$\lim_{x\to-6}\frac{x^2+4x-12}{x+6}$
$\left(mx+m+4\right)^2$
$\int\frac{6x^3-x^2-5x-7}{3x^2-x-2}dx$
$\frac{d}{dx}\left(\frac{x^2}{1-x}\right)$
$\left(1+x^2\right)\frac{dy}{dx}=1+y^2$
$\left(4-2x\right)^2$
$8\cos^2\left(a\right)+7=11$
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