$-\left(1+x\right)^2$
$x^2+6xy+5x^2$
$l=\left(x+4\right)\left(x+2\right)+\left(x+3\right)\left(x+5\right)-2x\left(x+7\right)+7$
$-9+8-1+4+3-2-9$
$\frac{1}{\tan\left(105^o\right)}$
$\frac{9}{x+1}<5$
$426\cdot3$
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