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)/gcos^2alpha`
(b) `(u^2)/gcos^2 2alpha`
`(2u^2)/gcos^2 2alpha`
(d) `(2u^2)/gcos^2alpha`
A. `u^(2)/gcos^(2)alpha`
B. `u^(2)/gcos2alpha`
C. `(2u^(2))/gcos2alpha`
D. `(2u^(2))/gcos^(2)alpha`
