Saved Bookmarks
| 1. |
Prove that: sin(n+1)x⋅sin(n+2)x+cos(n+1)x⋅cos(n+2)x=cosx |
|
Answer» Prove that: sin(n+1)x⋅sin(n+2)x+cos(n+1)x⋅cos(n+2)x=cosx |
|