Input: dsolve(ds(y,x,3)-4ds(y)- 2ds(y)*y)
Write: `dsolve(ds(y,x,3)-4ds(y)- 2ds(y)*y)`
Output: $$dsolve(\frac{d^{{3}}y}{dx^{{3}}} - 4\ \frac{dy}{dx} - 2\ \frac{dy}{dx}\ y)== gsolution(4,2\ _f(1,x),y,x,3)$$
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