I have never used this item since purchasing it, so it is new and unused. Please purchase only if you understand that it has been stored at home. A formula guide book that is fully compliant with the Mathematics III textbook. - Title: Textbook Guide Mathematics III - Publisher: Gakushu Books - Price: 2640 yen - ISBN: 978-4-7714-1580-8 - Fully Compliant: Fully Compliant Thank you for looking.