$-2n+1+8n+n-6+1$
$4a^3+bx-4bx$
$4x-3=2x+7$
$\frac{d}{dx}x^{tan2x}$
$f\left(x\right)=\cos2x\ctan2x-8$
$\cos\left(x\right)\tan\left(x\right)^2=\cos\left(x\right)$
$a^2b^2\left(ab+a^3b^2\right)$
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