$2tan2x-1=0$
$\frac{0.00000762939453125}{2}$
$\frac{dy}{dx}=\frac{2x}{2x+xy}$
$\left(e^x+e^{-x}\right)dy=\sqrt{25-y^2}dx$
$7x-8+-3x-7$
$6x+4x^2-x^2+3x^3-x^2-3x$
$2x^2+4xy+2ya$
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