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cosC° = ac²+bc²-ab²/(2.ac.bc)
cosC° = 6²+(3√3)²-3²/(2.6.3√3)
cosC° = 36+27-9/(36√3)
cosC° = 54/(36√3)
cosC° = 3/(2√3)
cosC° = 3/(2√3) × 2√3/(2√3)
cosC° = √3/2
C° = 30°