$4x^4-20x^2+12x^3-8^5$
$x^3-9x^2+27-27$
$x-1<16$
$y=\left(x+y\right)^2$
$\frac{x}{2x+1}=\frac{2x}{x+2}$
$\frac{1-cos2x}{1+cos2x}=cos^2x$
$x^2-\frac{x}{5}=18$
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