Which of the following can be used to describe the formula for determining vertical distance when the staff is vertical and the line of sight is inclined:
1
V = Ks sin2 θ/2 + K cos θ
2
V = Ks sin2 2 θ + C cos θ
3
V = Ks sin2 θ + C cos θ
4
V = (Ks sin 2θ)/2 + C sin θ