Write down a unit vector in XY-plane, making an angle of 30° with the positive direction of x-axis.
Given: A unit vector in XY- plane.
Let is a unit vector in the given XY- plane then the value of
Will be :
θ is the angle given, which is made by unit vector with positive direction of x-axis.
∴ for θ = 30°
Hence, the required unit vector is .