$x\frac{dy}{dx}-2y=3x^2+2x$
$\frac{\frac{1}{2}x^2}{1}-\frac{\frac{1}{2}}{2}y^2$
$\cos x+\cos y=1$
$5x^2-2x+x^2+3-2$
$\sqrt[30]{16.x^8}$
$\sqrt{\sqrt{x-5}+x}=5$
$25:5-14:2-18:3$
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