$\frac{1}{x+1}-\frac{1}{x-1}=1$
$\frac{d}{dx}x^2y^2-2x=1$
$\left(7d-4f^5\right)^3$
$7-\left(6-5\right)^2$
$\frac{\left(1-\cot\:x\right)^2}{\csc^2x}$
$4xy+12x^2$
$a2+11a+36$
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