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Suppose that ABC has BAC = 36 and ABC = ACB = 72. Let D be on AB so that DCB = 36. Use this

Suppose that ABC has BAC = 36 and ABC = ACB = 72. Let D be on AB so that DCB = 36. Use this configuration to determine the exact value of cos(36), and then use the value of cos(36) to determine the exact value of sin(36)

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