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Let (alpha,beta) be a point from which t...

Let (alpha,beta) be a point from which two perpendicular tangents can be drawn to the ellipse `4x^(2)+5y^(2)=20`. If `F=4alpha+3beta`, then

A

`-15leFle15`

B

`Fge0`

C

`-5leFle20`

D

`Fle-5sqrt5 or Fge5sqrt5`

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The correct Answer is:
A
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