InterviewSolution
Saved Bookmarks
| 1. |
Prove that: `cotAcot2A-cot2Acot3A-cot3AcotA=1` |
|
Answer» `3A=2A+A` `rArr cot3A=cot(2A+A)` `rArr cot3A=(cot2AcotA-1)/(cotA+cot2A)` `rArr cot3A cotA+cot2Acot3A=cotAcot2A-1` `rArr 1= cotAcot2A-cot2Acot3A-cot3AcotA` Hence Proved. |
|