THe diagram shows particles A and B connected by a light inextensible string that passes over a small smooth pulley C. Pulley C is fixed at the top of a wedge which is fixed on a horizontal plane. Particle A is on the face of the wedge which makes an angle of alpha with the horizontal with the portion of the string AC parallel to the line of the greatest slope of the face. Particle B is on the face of the wedge which makes an angle of beta with the horizontal with the portion of the string BC prarallel to the line of the greatest slope of the face. Weight of each particle A and B is W and the coefficient of friction of each particle with the faces of the wedge is . If and particles A and B are about to slide, show that