Which of the following differential equations can be solveusing determination ofintegrating factor? а. 2у(x + у + 2)dx - (у? — х? — 4х — 1)dy —D 0 b. y?dх + (3x? у+ у? — 1)dy 3D 0 c. (x? + y? + 1)dx + x(x – 2y)dy = 0 d. 2y(x? — у + х)ах + (2x? — 2у)dy —D0 e. none of the choices -

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