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if the line y = 2x + c be a tangent to t...

if the line `y = 2x + c` be a tangent to the ellipse `x^2/8+y^2/4=1` , then c is equal to

A

`pm 4`

B

`pm 6`

C

`pm 1`

D

`pm 8`

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The correct Answer is:
B
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