sin 30° = 1/2, cos 60° = 1/2 - 30° + cos 60° ?, cos 60° = 1/2 - cos 60° ?, tan 45° = 1 - tan 45° ?, cos 0° = 1, sin 90° = 1 + 1 = 2 - cos 0° + sin 90°, sin 60° × cos 30°,

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