I need help with solving the following.

(a) if cos() = 8/17, what are the two possible values of sin()? sin() =

(b) if sin() = -0.8 and is in the third quadrant of the xy plane, what is cos()? cos () =

(c) if sin()= 4/7, what is sin(pi/2 - () )? sin(pi/2 - () )=

(a) If cos(6) = %, what are the two possible values of sin(6)? (Enter your answers as a comma-separated list.) sin(6) = (b) If sin(f) = 0.8 and O is in the third quadrant of the xy plane, what is cos(6)? cos(6) = (c) If sin(6) = sin(% - e) N{EN , what is sin(% - 9)? (Enter your answers as a comma-separated list.)