$100n^2-10n-20$
$\frac{x^2}{1+x^4}$
$\sqrt[3]{24a^6b^5}$
$\frac{1-cos^2x+sin2x-sin^2x}{1+cos2x}=\tan\left(x\right)$
$1-x=\sqrt{2x+5}$
$4+1-9-10+6$
$7ax+5cb-4ax-2bc$
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