Ready solution of the problem. The sorcerer of Arutyunov. Task number 451.
451 - 460. Find the first three nonzero expansion terms in the power series of the solution y = y (x) of the differential equation y ´= f (x, y) satisfying the initial condition y (0) = y0.
451. y ´= cosx + y2; Y (0) = 1.
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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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