$\left(6a-4b+2\right)^2$
$\frac{3x}{2+32x^4}$
$\sin\left(x+45\right)+\sin\left(x-45\right)$
$\lim_{x\to a}\frac{x-a}{\sin\left(x-a\right)-2x+2a}$
$b^2-11b+28$
$\lim_{x\to8}\left(x-8x^2-64\right)$
$1-\frac{1}{x+1}$
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