A particle is projected at an angle alpha with the horizontal.Show that if alpha is greater than cos^(-1)1/3=70.5^@, the distance of the projectile from the point of projection increases to a maximum above the horizontal plane.

A particle is projected at an angle alpha with the horizontal.Show tha

1.	A particle is projected at an angle alpha with the horizontal.Show that if alpha is greater than cos^(-1)1/3=70.5^@, the distance of the projectile from the point of projection increases to a maximum above the horizontal plane.
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