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method of separation of variables.(x2y+ 2xy+ 5y)dy= (y2+ 7)dx2 integration factor. xdy/dx−2y=x4sinx3. variation of parameters: y′−y=xex/x+1

method of separation of variables.(x2y+ 2xy+ 5y)dy= (y2+ 7)dx2

integration factor. xdy/dx−2y=x4sinx3.

variation of parameters: y′−y=xex/x+1

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