The "Mathematical Formulas. Formula Collection E (Extended Edition)" by Klett & Balmer is a comprehensive textbook specifically designed for use in high schools. This work provides a structured and easily accessible collection of mathematical formulas that is beneficial for both students and teachers. The collection is intended to enhance the understanding of mathematical concepts and serves as a valuable reference during the learning process. With a clear layout and user-friendly structure, this book allows for quick retrieval of the needed information. The formula collection is written in German and offers a variety of formulas applicable in different mathematical disciplines. The extended edition ensures that the content is current and relevant to meet the demands of modern teaching.