Help solve please Not sure why I could not just plug it in a

Help solve please. Not sure why I could not just plug it in and get an answer, Maybe I have the mode wrong in the calculator? Using Ti84 PLus.

The terminal point P(x, y) determined by a real number t is given. Find sin(t), cos(t), and tan(t) sin(t) = sin(t)--2 cos(t) =| E tan(t) = an(i)

tan(t) = sin(t)/cos(t) = -2 x (6)^1/2