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Old 08-06-2007   #1
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Default math question please help!?

I'm helping my brother study for his grade 11 math exam, but it's been a few years since I've been there and I'm having trouble remembering the rules. Could anyone help me solve the following question? Thanks everyone!Find the equation of the hyperbola having foci (0,6) and (0,-6) if the difference of the focal radii is 4

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