Please solve it... Share with your friends Share 0 Subham Kumar Singh answered this Dear Student , Regards 0 View Full Answer Nkdklklkjks Hhaha answered this You have to put the value of cos alpha then you can prove!! 0 Nkdklklkjks Hhaha answered this alpha= 30 degree!! Now put the value of alpha in the next equation hence it will be proved!!! 0