We need to find find value of : 3 cos 80° cosec 10° + 2 cos 59° cosec 31° 3 cos 80 cosec (90-80) + 2 cos 59 cosec (90 - 59) 3 cos 80 sec 80 + 2 cos 59 sec 59 as, cos 80 sec 80 = cos 59 sec 59 = 1, then 3 cos 80 sec 80 + 2 cos 59 sec 59 = 3 + 2 = 5