A projectile aimed at a mark which is in the horizontal plane through the point of projection falls a cm short of it when theh elevation is alpha and goes b cm far when the elevation is beta. Show thatif the speed of projection is same in all the cases the proper elevation is

A projectile aimed at a mark which is in the horizontal plane through

1.	A projectile aimed at a mark which is in the horizontal plane through the point of projection falls a cm short of it when theh elevation is alpha and goes b cm far when the elevation is beta. Show thatif the speed of projection is same in all the cases the proper elevation is
Answer» Answer :`1/2 sin^(-1)[(a sin 2 ALPHA a+b sin2 BETA)/(a+b)]`