F
G E
FG and EG are the legs and EF is the hypotenuse
EG = sqrt [ EF^2 - FG^2 ]= sqrt [ 8^2 - 6^2 ] = sqrt [ 64 - 36 ] = sqrt [ 28 ] = 2sqrt (7)
So
cos F = FG / EF = 6 / 8 = 3 / 4
tan F = EG / FG = 2sqrt (7) / 6 = sqrt (7) / 3
sec E = EF / GE = 8 / [ 2 sqrt (7) ] = 4 / sqrt [7] = 4sqrt (7) / [ sqrt (7) * sqrt (7) ] = 4sqrt (7) / 7