TY  - BOOK
AU  - Delbourgo, Roger
TI  - Trigonometry : : notes, problems and exercises 
SN  - 978-981-3207-10-3
AV  - 516.24 D37t 2017 
PY  - 2017///
CY  - Singapore
PB  - World Scientific
KW  - Trigonometry
KW  - Textbooks
ER  -