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arctan( (sin(54°)*sin(48°) - sin(48°)*sin(66°)) / (sin(48°)*cos(66°) - sin(54°)*cos(48°)) )
arctan( (sin(54°)*sin(48°) - sin(48°)*sin(66°)) / (sin(48°)*cos(66°) - sin(54°)*cos(48°)) )
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