00279nam a22001217a 4500020001500000040000900015082001600024100002400040245001800064250001900082260003800101650001800139  a0030247837  cNUST  a516.24bMCK  aCharles P. Mckeague  aTrigonometry   aFourth Edition  aNew York:bEmily Barrosse,c1999.  2Trigonometry