If the range of a gun which fires a shel...

If the range of a gun which fires a shell with muzzle speed v is R, then the angle of elevation of the gun is

`cos^-1(v^2/Rg)`

`cos^-1(gR/V^2)`

`1/2 (v^2/Rg)`

`1/2 sin^-1(gR/v^2)`

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