1. The problem statement, all variables and given/known data A unit vector lies in the xy plane, at an angle of 131 degrees from the +x axis, with a positive y component. What is the unit vector? 2. Relevant equations cos[STRIKE]O[/STRIKE]=adj/hyp 3. The attempt at a solution cos131*=adj/hyp I know that the z component is obviously 0 (xy plane). The x component is negative in order for the angle to be 131*. So... -.656=adj/hyp And... ((sqrt)x^2+y^2)=1 since it's a unit vector. Basically, I don't know where to go from here. I know the magnitude is 1, and I know what the angle is, but I don't know how to find out the x and y component values. Any help is greatly appreciated.