$144=\frac{x^2}{x^2+16}$
$x^2-36x+12=0$
$2a^2+a=1$
$\int\frac{2x^2-2x+3}{\left(x^2+2\right)^2}dx$
$2sin^2x-2sinx-1=0$
$\int\left(e^{2x+1}\right)du$
$\frac{\left(5y^2-6y+7\right)}{5y-1}$
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