Question

poooooor favoooooor, ajudeeeeeeem​

Answer 1

sena=√1 -cos²a

sena =√1 -(1/16) =√15/16 =√15 /4

a/ sena = b/ senb

8/ √15/4 = 4/ senb

8• 4/√15 = 4/senb ===> :(4)

8/√15 = 1/senb

8senb = √15

senb = √15 /8 ✓