$\sqrt{3}+\sqrt{4\cdot3}$
$\lim_{x\to0}\left(\frac{tan\left(9x\right)}{ln\left(1+x\right)}\right)$
$3\left(x+1\right)-5=ax+b$
$\frac{\sin\left(x\right)}{1-\cos\left(x\right)}-\frac{1}{\sin\left(x\right)}=\tan\left(x\right)$
$84^2-74^2$
$\left[\left(x^2-2x\right)+6\right]\left[\left(x^2-2x\right)-6\right]$
$x^2-2x+\frac{1}{x}-1$
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