The length of the chord of the parabola ...

The length of the chord of the parabola `x^(2) = 4y` passing through the vertex and having slope cot `alpha` is

A

`4 cosalpha cosec^2alpha`

B

`4 tan alpha sec alpha`

C

`4 sin alpha sec^2 alpha`

D

none of these

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The correct Answer is:

A

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