$\lim_{x\to-1}\left(\frac{3x^4+9x^3+x+7}{x+1}\right)$
$\frac{x^2+2x-5}{x+1}$
$\int6x^{-2}dx$
$\left(x^2-2\right)^2\frac{dy}{dx}+4x=0$
$( 2 x - y ) ^ { 4 }$
$2\left(2x^2-4x+1\right)$
$\int\left(3x^4+3\right)^3+\left(12x^3\right)dx$
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