$x^2-4x\ge0$
$9x+2y+x+15y+10x+3y+11x-y$
$\frac{cos^5\left(x\right)}{5}-1$
$\frac{-6y-9}{3y}$
$\left(x-4\right)^2+\left(x+2\right)^2=20$
$\log_{21}\left(x\right)+\log_{21}\left(x-4\right)=1$
$\sqrt[4]{m^8}$
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