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Let alpha(1) and alpha(2) be the ordinat...

Let `alpha_(1)` and `alpha_(2)` be the ordinates of two points A and B on a parabola `y^2=4ax` and let `alpha_3` be the ordinate of the point of intersection of its tangents at A and B. Then `alpha_3-alpha_2=`

A

`alpha_3-alpha_1`

B

`alpha_3+alpha_2=`

C

`alpha_1`

D

`alpha_1-alpha_3`

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The correct Answer is:
D
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