III. Use a double angle or half angle identity to find each of the following. Write...

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III. Use a double angle or half angle identity to find each of the following. Write the identity then show work, 7. Given cos 20 = 1 and 270° < 0 < 360°, find sin 8. 8. Given cos A = V/²³ and sin 8×0, find cos 20. √3 5 9. Find the exact value of sin 15° II. Solve each equation for exact solutions over the interval [0, 27). 11. Sin x= V₂ 10. Cos 0 = 0 13. 4 cos ²0 -3 = 0 15, sin x (2cosx+1)=0 Cot x = -1 14₁ 3 tań² 0 = | 12. 16. cscxcscx - 2 = 0 III. Use a double angle or half angle identity to find each of the following. Write the identity then show work, 7. Given cos 20 = 1 and 270° < 0 < 360°, find sin 8. 8. Given cos A = V/²³ and sin 8×0, find cos 20. √3 5 9. Find the exact value of sin 15° II. Solve each equation for exact solutions over the interval [0, 27). 11. Sin x= V₂ 10. Cos 0 = 0 13. 4 cos ²0 -3 = 0 15, sin x (2cosx+1)=0 Cot x = -1 14₁ 3 tań² 0 = | 12. 16. cscxcscx - 2 = 0