First thing, let's see how many full loops we can get out of that angle, theta = 600^"o" = 360^"o" + 240^"o" = 2*360^"o" - 120^"o"
Why this is important, you may ask? It's because every 360^"o" degrees we have a full loop and return to where we were. So for the two main trig functions, sin(x) and cos(x) we can say that
sin(600^"o") = sin(240^"o") = sin(-120^"o")
cos(600^"o") = cos(240^"o") = cos(-120^"o")
And since every other function is a ratio of one or two of these functions, we can work with that. Now, we know that
sin(-theta) = -sin(theta) and cos(-theta) = cos(theta)
So we can say that
sin(600^"o") = -sin(120^"o")
cos(600^"o") = cos(120^"o")
We can then use the angle sum / double angle formula, since 120^"o" = 60^"o"+60^"o"
-sin(120^"o") = -(sin(60^"o")cos(60^"o") + sin(60^"o")cos(60^"o"))
cos(120^"o") = cos(60^"o")cos(60^"o") - sin(60^"o")sin(60^"o"))
Since 60^"o" is a special angle we know that sin(60^"o") = sqrt(3)/2 and cos(60^"o") = 1/2, so
-sin(120^"o") = -(sqrt(3)/2*1/2 + sqrt(3)/2*1/2) = -sqrt(3)/2
cos(120^"o") = 1/2*1/2- sqrt(3)/2*sqrt(3)/2 = -2/4 = -1/2
And from that, we just evaluate the others by division:
sec(600^"o") = 1/cos(600^"o") = -1/(1/2) =-2
csc(600^"o") = 1/sin(600^"o") = -1/(sqrt(3)/2) = -2/sqrt(3) = -(2sqrt(3))/3
tan(600^"o") = sin(600^"o")/cos(600^"o") = (sqrt(3)/2)/(1/2) = sqrt3
cot(600^"o") = 1/tan(600^"o") = 1/(sqrt(3)) = sqrt(3)/3