$\left(x^2+y^2\right)dx-3xydy=0$
$cosa\left(tana+cota\right)=csca$
$\frac{dy}{dx}=330x^4y\left(1+4x^5\right)^{\frac{1}{2}}$
$3x-3\ge9-x$
$x^3y-x=5$
$4\frac{dy}{dx}-2x^2y=0$
$2x^2+5y^2;\:x=-1;\:y=2$
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