TY  - GEN
AU  - Chulawansa , S. M. Lal
AU  - Goonewardena , M. P. 
TI  - Trigonometry II: Pure mathematics Blok 2 Unit 2
U1  - 516.24 
PY  - 2001///
CY  - Sri Lanka
PB  - Open university of Sri lanka
KW  - MATHEMATICS
KW  - TRIGONOMETRY
ER  -