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The equation of hyperbola whose focus is...

The equation of hyperbola whose focus is (5,0) and corresponding directrix is `x=4`, is:

A

`4x^2-y^2=20`

B

`x^2-4y^2=20`

C

`x^2-4y^2=25`

D

`4x^2-y^2=25`

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