$\frac { 4 } { \frac { 1 } { 3 } }$
$\int\frac{16x+13}{4x^2+7x+12}dx$
$\left(x+2+y\right)\left(x+y\right)$
$\frac{4x}{x^4+1}$
$-6x-19y+26v+2x-6y-16v$
$\frac{dy}{dx}+2xy=\left(3x^2+2x+1\right)e^{-x^2}$
$\int\frac{sen^2xcotx}{secx}dx$
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