$\frac{x^2}{9x^7}$
$2\csc x+1=\csc x+3$
$x^2+xy+yx+y^2$
$25w^2-60w+36$
$\frac{1}{2}\left(6e\:-\:3f\:-\:\frac{3}{4}\right)\:$
$6x^2+12x+144$
$58-5+12$
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