$16x^2-56xy+49y^2$
$\frac{x^2-\left(y+2\right)}{xy-y^2-2y}$
$\frac{2cos\left(3x\right)+1}{cos}$
$6x^2+13x-8$
$20x-7=5+14x$
$-3-y^2=24$
$\frac{48-40}{3x^2+2x+3}$
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