$xydy=\left(y-1\right)\left(x-1\right)dx$
$a^2-\:x^2\:$
$28m^2-11m-30m^2$
$x^2+3x=18$
$\frac{9^7}{9^5}$
$23p+\frac{1}{4}-\frac{1}{4}\left(8p+1\right)=5\left(4p-6\right)+10$
$csc\left(\frac{\pi}{2}-t\right)$
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