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If the normal at the point `P(theta)` to the ellipse `x^2/14+y^2/5=1` intersects it again at the point `Q(2theta),` then `Costheta` is equal to (A) `2/3` (B) `(-2)/3` (C) `3/4` (D) non of these

A

`(-2)/3`

B

`2/3`

C

`(-6)/7`

D

`6/7`

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A
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