$1-1-1-1-1-1-1$
$\left(x+10\right)^2-\left(x+6\right)^2-8x$
$\lim_{x\to1}5$
$\cos x+2x\right)^{2}$
$\frac{4x^2+2x-7}{2x-3}$
$-548+111$
$\lim_{x\to0}\sin\left(2x\right)\ln\left(\frac{2x}{e^{2x}-1}\right)$
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