Saved Bookmarks
| 1. |
2sin 4Asin 5A |
|
Answer» sin4A/sin5A=tan4A = sin4A / cos4Asin5A = cos4A => sin5A = cos(π/2 - 5A) = cos4Aπ/2 - 5A = 4A9A = π/2A = π/18 |
|