$\left(-148\right)+\left(-315+\right)\left(-218\right)$
$x\cdot x+6=315$
$\left(5a\:+\:4\right)^2$
$\left(1+y\right)dx+\left(xy\right)dy=0$
$\lim_{x\to2}\left(x^2-4x+2\right)$
$\frac{tan\left(x\right)}{1-\frac{1}{tan\left(x\right)}}+\frac{cot\left(x\right)}{1-tan\left(x\right)}$
$\frac{x}{x+3}+1\le0$
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