$20\log\left(4.5\right)$
$\frac{x^{-1}}{4x^4}$
$18y^{2}+15y-18$
$\cos\left(n\right)+\sin\left(n\right)\cdot\tan\left(n\right)=\sec\left(n\right)$
$2x^2-4x+8$
$4x^2+4\left(x^2+1\right)$
$\left(3y+2y^3\right)^5$
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