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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

(a) `-15leFle15`

B

(b) `Fge0`

C

(c) `-5leFle20`

D

(d) `Fle-5sqrt5 or Fge5sqrt5`

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A
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