$\frac { 8 x ^ { 4 } + 15 x - 24 } { x ^ { 2 } + 3 x + 5 }$
$15f-5+2f$
$2\cos^2w$
$\frac{3}{7}-\frac{2}{4u}$
$\frac{dy}{dx}\left(\frac{x^2}{y}-\frac{y^2}{x}=xy\right)$
$in\:y\frac{dy}{dx}+2x^2in\:x$
$\left(3+x\right)^2=9+x^2+8x$
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