This Android application is a Student Book and Mathematics Teachers Guidebook for SMA / SMK Class XI Independent Curriculum. In Pdf format.Mathematics is often considered an abstract, difficult and less relevant subject in life. In fact, many mathematical concepts and principles actually appear in nature and are close to everyday life. Our hope is that this book can change misperceptions about mathematics by using a more contextual approach through real life problems and actively involving students in exploration with guiding questions.Most of the mathematics lessons in this book are attempted to attract students attention and interest so that they "do not feel like they are learning mathematics". Students will be invited to think critically and creatively to develop higher level thinking skills (HOTS). Apart from that, on many occasions students will discuss, communicate, work together and use technology to solve problems so as to hone their abilities in accordance with the Pancasila Student Profile and 21st century skills.We would like to express our thanks to various parties who have helped make this book possible, especially the reviewers, namely Prof. Dr. Widowati, M.Sc. (Diponegoro University) and Dr. Ali Mahmudi (Yogyakarta State University) for valuable guidance and input from start to finish of the writing process.Finally, we hope that this book will be useful for teaching mathematics in SMA/SMK Class XI, and that more and more students will start to enjoy mathematics and feel the benefits of learning mathematics.Happy maths!Hopefully this application can be useful and become a loyal friend in the teaching and learning process at all times.Please give us reviews and input for the development of this application, give us a 5 star rating to encourage us to develop other useful applications.Happy reading.Disclaimer:This Student Book or Teachers Guide is a free book whose copyright is owned by the Ministry of Education and Culture.Material sourced from https://www.kemdikbud.go.id. We help provide these learning resources but do not represent the Ministry of Education and Culture.