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Advanced methods of trigonometry can be used to find the exact value. Use the exact value sin 18° = 15 - 4 and identities to

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sin 18° - 15-1 b sin (90°-72 ) = V5-1 4 E COS 720 V5-) 4 - 4 √5 -1 个 see72² 11 65729 V5-1 4 4(15+) V5-1) (15+) 4 (15+) 5-1 4

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