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The first half of your query refers to the solutions manual ( solucionario ) for widely used textbook, Power Electronics: Circuits, Devices, and Applications . The second half refers to GBWhatsApp , an unofficial, modified version of the messaging app. Rashid Power Electronics Solutions Manual
Muhammad H. Rashid is a premier authority in power electronics, and his textbooks are standard for electrical engineering students. The first half of your query refers to
is a popular third-party modification that adds features not found in the official app, such as hiding "last seen" status, custom themes, and sending larger files. Power Electronics: Circuits