$\frac{d^4}{dx^4}\left(\frac{1+x}{1-x}\right)$
$\sqrt{27}\cdot\sqrt{\frac{96}{81}}$
$x^2\:-\:5x\:+-12.25$
$\sec^{2}a+\csc$
$\left(k-m-3\right)\left(k-m+3\right)$
$5x^5-5x^4$
$\int6^{\left(5x+1\right)}dx$
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