Saved Bookmarks
| 1. |
( 11 ) \tan 18 ^ { \circ } + \tan 27 ^ { \circ } + \tan 18 ^ { \circ } \cdot \tan 27 ^ { \circ } = 1 |
|
Answer» Let us add 18 and 27 to get 45. So tan(18+27) = 1 = tan 18 + tan 27/[1 - tan 18.tan 27] or tan 18 + tan 27 = 1 - tan 18.tan 27, or tan 18 + tan 27 + tan 18.tan 27 = 1. Hence the answer is 1. |
|