The length of the chord of the parabola \( x^{2}=4 a y \) \( \mathr...

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The length of the chord of the parabola \( x^{2}=4 a y \)
\( \mathrm{P} \) passing through the vertex and having slope tan \( \alpha \), is:

W
(1) \( 4 a \operatorname{cosec} \alpha \cot \alpha \)
(2) \( 4 a \tan \alpha \sec \alpha \)
(3) \( 4 a \cos \alpha \cot \alpha \)
(4) \( 4 a \sin \alpha \tan \alpha \)
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