$x^2-8x-1008>0$
$\left(x^2y-x^2\right)dx+\left(y^2x-y^2\right)dy=0$
$\left(-4y^{1-x}\right)^0$
$\frac{4}{9x^2}-\frac{1}{3xy}+\frac{1}{16y^2}$
$-\left[-6+5+\left(0-3\right)-\left(-5-1\right)\right]$
$\frac{x^2-3x+2}{4-x^2}$
$\left(\frac{3}{4}+12k\right)^2$
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