In power electronics, many principles such as digital circuits, analog circuits, and electrical fundamentals need mathematical knowledge, and electrical engineering and its automation are involved. Anyway, you are studying theory now, and mathematics is a must. Only by learning theory well and combining it with practice in future work will it be useful. You haven't even learned the theory and principle well, and it will be very difficult to solve many problems without this professional knowledge in the future, so I suggest you study the theoretical knowledge well, make up your mind and believe it.