The length of the latus rectum of the pa...

The length of the latus rectum of the parabola whose focus is `(u^2/2g sin2alpha, -u^2/2g cos2alpha) and directrix is `y=u^2/2g`,is

`(u ^(2))/( g ) cos ^(2) alpha `

`(u ^(2))/( g ) cos 2 alpha `

`(2 u ^(2))/( g ) cos ^(2) 2 alpha`

`(2 u ^(2))/( g ) cos ^(2) alpha `

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