$\cos^2x+4\cos x=0$
$4x-5^2$
$\left[\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)\right]^2\:-\left(x^2-4x\right)-1$
$4x\le12$
$5a-b=29$
$f\left(x\right)=3^3-2x+6$
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