Solution
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
Get AI Help
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
