$\cos2x+5\cos x-6=0$
$a^4-2a^2-35$
$\left(5^2x^3y^3\right)^{-3}$
$12p^2-7p-12$
$36m^2-81n^2$
$\frac{3}{12x^2}$
$\sec\left(x+30\right)=2.5$
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