$2f+6\ge-4$
$\lim_{x\to-3}\left(\frac{3x^2+1}{x^2-9}\right)$
$\cosh\cdot\tanh:\sinh$
$\left(x-4\right)^2=x^2-40$
$\frac{1}{\cos\left(x\right)^2}=\sec\left(x\right)^2$
$\frac{x^2-9x+14}{x-2}$
$\left(-2.0\right)+\left(-7.3\right)$
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