$144a^2-121b^2$
$\left(x^2y+1\right)^2$
$9n^2-24n+16$
$8t^2+10t+5=0$
$-4a^3-9$
$\frac{d^2}{dx^2}\left(2xy+y^2+2x=5\right)$
$\lim_{x\to0}\left(\frac{e^{t}-e^{-x}-2x}{x-\senx}\right)$
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