Saved Bookmarks
| 1. |
sinA +sin B A+BcosA+cosB ~ 2 |
|
Answer» (sinA+sinB)/(cosA+cosB) = (2sin(A+B)/2*cos(A-B)/2)/(2cos(A+B)/2*cos(A-B)/2) = tan(A+B)/2 |
|