Let OA and OB be the lines through the origin making an angle of 60° with the Y-axis.
Then OA and OB make an angle of 30° and 150° with the positive direction of X-axis.
∴ slope of OA = tan 30° = 1/√3
∴ equation of the line OA is
Slope of OB = tan 150° = tan (180° – 30°)
= tan 30° = -1/√3
∴ equation of the line OB is
∴ required combined equation is