$u^2-6u+9$
$16f^2+8f+1$
$100x^2+120xy+50$
$-17-\left(-17\right)$
$y=\frac{4x+2}{\left(3-2x\right)^3}$
$\frac { x _ { 1 } } { x _ { 1 } }$
$\lim_{x\to0}\left(j^2\left(j+9\right)^2\right)$
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