$7\:x\:10-8\cdot3896103.8961\:$
$\cos^2x-3\cos x=-2$
$\frac{a^6-2^6}{a+2}$
$2.3\cdot10^4$
$a^2-a<0$
$\left(x^3y^2-5\right)\left(x^3y^2+5\right)$
$\left(x+1\right)^2\left(x-1\right)-2x^2$
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