Saved Bookmarks
| 1. |
Without using trigonometric tables, evaluate the followms(Sin2 25° + Sin2 65°)+ (tah 5°tan 15 tan 30°tah 750 tan 85°)3 |
|
Answer» Sin²25°+sin²65°+√3(tan5°tan15°tan30°tan75°tan85°)=sin²25°+sin²(90°-25°)+√3{tan5°tan15°×(1/√3)×tan(90°-15°)tan(90°-5°)}=sin²25°+cos²25°+√3×1/√3(tan5°tan15°cot15°cot5°)=1+1=2 Ans. |
|