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Prove that the tangents drawn on the par...

Prove that the tangents drawn on the parabola `y^(2)=4ax`at points x = a intersect at right angle.

A

`y=x-3/2a`

B

`y=-x-3/2a`

C

y = x - a

D

y = x + a

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The correct Answer is:
A
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