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BỘ GIÁO DỤC VÀ ĐÀO TẠO ĐẠI HỌC ĐÀ NẴNG TRẦN THỊ TỐ NHƯ CÁC TOÁN TỬ TÍCH PHÂN DẠNG FOURIER HỮU HẠN VÀ ỨNG DỤNG Chuyên ngành: Phương pháp Toán sơ cấp Mã