$\left(2x+5\right)\left(2x+5\right)\le11$
$20-15mas\:45$
$-x^2-4x+5>0$
$\left(\frac{3x}{2}+xy^2\right)^2$
$\frac{cosx}{sinxtanx}=sec^2x$
$x\left(7+6x\right)x\left(7+6x\right)\:$
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