Saved Bookmarks
| 1. |
How do you find the exact value of cos 36° using the sum and difference, double angle, or half-angle formulas? |
|
Answer» The exact value of cos 36° using the sum and difference, double angle, or half-angle formulas is cos 36° = (√5 +1) / 4 Double angle formulas are used to express the trigonometric ratios of double angles (2θ) in terms of trigonometric ratios of single angle (θ) and similarly, half-angle formulas are used to express the trigonometric ratios of half angles ((1/2)θ) in terms of trigonometric ratios of single angle (θ). |
|