Which of the following differential equations is exact? 1. (2х+ 3у)аx+ (3х + 2у)dy %3D0 п. (3х + 2у)dx + (2х + 3у)dy %—D0 II. 2xydx – (x? + 2)dy = 0 а. I andI only с. I and Ш only e. none of the choices IV. ydx — хdу — 0 b. П аnd Ш only d. П andIV only

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