A particle is projected at an angle α with the horizontal from the foot of an inclined plane making an angle β with horizontal. Which of the following expressions holds good if the particle strikes the inclined plane normally?
(a) cotβ = tan(α – β)
(b) cotβ = 2tan(α – β)
(c) cotα = tan(α – β)
(d) cotα = 2tan(α – β)
