#4) Solve the differential equation by variation of parameters. Remember to simplify the final solution y + y = sin(x) + ++++++++++++++++ ++ + +
#4) Solve the differential equation by variation of parameters. Remember to simplify the final solution y" + y = sin(x) + ++++++++++++++++ ++ + + # 5) The independent variable x is missing in the given differential equation. Solve the equation by using the substitution u = y' and y" = du/dy*dy/dx =u*du/dy. Directly, y" =u.du/dy (y + 2 )y" = (vr)2 ++++++++++++++++++++ ++++++
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