$cos2x=5-6cos^2x$
$y+6-1.5-y+17-5y$
$123.\pi122$
$\int\:x\left(3x+1\right)^7\:\:dx$
$\frac{dy}{dx}=\frac{e^x}{\left(e^y\right)\left(1+e^x\right)}\:$
$\frac{3x+2}{5}-\frac{5x-2}{4}+\frac{7}{10}$
$n^2-10+9$
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