$\frac { 1 } { ( 2 x y + y ) }$
$\frac{1}{4}^{-1}$
$a^2+5a+15$
$9x^2-12y=0$
$3x+4y+x+5y$
$\int _ { 2 } ^ { 2 } d x$
$8a^2+14a-15$
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