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if the tangents on the ellipse 4x^(2...

if the tangents on the ellipse `4x^(2)+y^(2)=8` at the points (1,2) and (a,b) are perpendicular to each other then `a^(2)` is equal to

A

`(128)/(17)`

B

`(64)/(17)`

C

`(4)/(17)`

D

`(2)/(17)`

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The correct Answer is:
C
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