00249nam a2200109Ia 4500020001500000082001700015100001400032245002400046250001200070260004000082650001700122  a817008010X  a516.24 BAL/H  aBali, N P 0aHigher Trigonometry  a3RD ED.  bLaxmi PublicationsaNew Delhic1985  aTrigonometry