Parametric Equation of a Curve

You are given the parametric equation of a curve and a value for the parameter t. Find the coordinates of the point on the curve corresponding to the given value of t.

x = sint-sin2t, y = cost+cos2t; t = 2pi/3

This is just substitution:

x = sin(2pi/3) - sin(2*2/pi/3) = sin(2pi/3) - sin(4pi/3) = sqrt(3).

y = (-1)... how do you think I got that value? Just do what I did for x.