$\left(3-6\right)+\left(26-7\right)\cdot3$
$\left|+3+64\right|+\left|+6+192\right|$
$1-\frac{1}{x}$
$tan\left(a\right)+1=sec\left(a\right)\left[sin\left(a\right)+cos\left(a\right)\right]$
$\frac{d}{dx}\frac{\sqrt{x+1\:}}{e^x-cosx}$
$\frac{x^3}{x^2+2x^2}$
$\frac{x^2}{81}-\frac{xy}{9}+y^2$
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