$g^6-169h^4$
$8a-2b+12a-2a-4b$
$-\frac{1+cot^2x}{cotx}=-\frac{1}{sinx\:cosx}$
$5m+30$
$2\cos^2x-3\cos x+1=0$
$\int9ve^{-8v}dv$
$a^3+a^3+a^3+a^3$
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