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A line parallel to the straight line `2x-y=0` is tangent to the hypernola `x^(2)/(4)-(y^(2))/(2)=1` at the point (`x_(1),y_(1))` Then `x_(1)^(2)+5y_(1)^(2)` is equal to :

A

10

B

8

C

5

D

6

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