Answer:
cos-1(6.9/12)
sin-1( 9.8/12)
tan-1(9.8/6.9).
Step-by-step explanation:
cos <BAC = adjacent / hypotenuse
= 6.9 / 12.
sin < BAC = opposite / hypotenuse = 9.8/12
tan < BAC = opposite/adjacent = 9.8/6.9
