$9cos^2x=-10cosx-1$
$\sqrt{24a^7}$
$\left(-25\right)-\left(-21\right)$
$\int_2^2100dx$
$\log_{16}\left(\frac{1}{2}x\right)+\log_{16}\left(\frac{1}{2}\right)=\log_{16}\left(6\right)$
$-3x^2+3x-7$
$\:\frac{2x^2+4x+2}{2x+1}$
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