$2n^3-8n^2+4n$
$\frac{x^2+2x-15}{x-1}$
$\frac{d}{dx}3y$
$\cos\left(2x\right)=\frac{\sin\left(2x\right)-\tan\left(x\right)}{\tan\left(x\right)}$
$\frac{vdv}{du}-u=0$
$\left(2x+y\right)^7$
$4secx+1=9$
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