Which expressions can be used to find m∠ABC? Select two options.

cos−1(StartFraction 9.8 Over 6.3 EndFraction)
cos−1StartFraction 6.3 Over 9.8 EndFraction)
cos−1(StartFraction 7.5 Over 9.8 EndFraction)
sin−1(StartFraction 9.8 Over 7.5 EndFraction)
sin−1(StartFraction 7.5 Over 9.8 EndFraction)
]