Two particles are projected from the same point with the same speed at different angles θ1 and θ2 to the horizontal. If their respective times of flights are T1 and T2 and horizontal ranges are same thena) θ1+θ2 = 900 b) T1 =  T2 tan θ1 c) T1  = T2 tan θ2 d) T1 sin θ2 = T2 sin θ1