$\left(1+x^2\right)\frac{dy}{dx}=x\left(1-y\right)$
$\frac{3x^2+4x-11}{x+3}$
$7\cdot i^2+144$
$\int-2xe^{-8x}dx$
$x+x+y$
$\frac{\tan^2a}{\tan^2a+1}=\cos^2a$
$25x^2+20x+4=0$
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