Saved Bookmarks
| 1. |
Prove that in any △ABC, cos A=b2+c2−a22bc, where a, b and c are the magnitudes of the sides opposite to the vertices A, B and C, respectively. |
|
Answer» Prove that in any △ABC, cos A=b2+c2−a22bc, where a, b and c are the magnitudes of the sides opposite to the vertices A, B and C, respectively. |
|