$4cos^2x+cosx-2$
$s^2+5s+8$
$2\cdot5+3-20$
$\frac{3x^2-16x+18}{x-3}$
$\frac{1}{x}<5$
$4\tan\left(3x\right)=9.648$
$\left(7x+x^4\right)^2$
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