$x^3-5x+4\:-\:x^3-4x-8$
$2\cos^2\left(x\right)-3\cos\left(x\right)=0$
$+27y+16y^2$
$7x+9x-8x+x$
$5^7:5^2$
$-x+5\le11+2x$
$\frac{\left(x-1\right)\left(x+1\right)\left(x-2\right)^2}{\left(x-2\right)}$
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