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The length of latus rectum of the parabola whose focus is`(u^2/(2g)sin2alpha,-u^2/(2g)cos2alpha)`and directrix is `y=u^2/2g` is
A. |
`u^2/gcos^2alpha` |
B. |
`u^2/gcos2alpha` |
C. |
`(2u^2)/gcosalpha` |
D. |
`(2u^2)/gcos^2alpha` |
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