$25x^2y^2-60xyz$
$x^3x+1$
$1-2cos^2x=sin^4x-cos^4x$
$4m^2-20m+26$
$4x^2+12x+9<0$
$\cot\left(x-30\right)$
$\lim_{x\to-1}\left(x^3-4x-1\right)$
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