$y=3x^2+4x+2$
$yx'-x=2y^2$
$\frac{dy}{dx}\left(x^{\frac{1}{2}}+y^{\frac{1}{2}}=9\right)$
$\frac{1}{1-\sin\theta}-\frac{1}{1+\sin\theta}$
$x^4+x^3+x^2+x$
$12+2x=16$
$\sqrt{8}=2.8284$
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