TY  - BOOK
AU  - Brummelen, Glen Van
TI  - Trigonometry: a very short introduction 
SN  - 9780198814313   Pb.
AV  - QA 531 B78 2020 CIRC 
PY  - 2020///
CY  - Oxford, United Kingdom
PB  - Oxford University Press
KW  - Trigonometry
N1  - Includes bibliographical references and index
ER  -