Question: I don't understand how they separated this DE. Especially the part by cos2x. d the orthogonal trajectories of this family. Rthogonal trajectovies : dy ey
I don't understand how they separated this DE. Especially the part by cos2x.

d the orthogonal trajectories of this family. Rthogonal trajectovies : dy ey = Secia dy du = ey 2 COOL = 2 1 + COD201 ) S e ey = -ba- sinautc." LC
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