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If (a, 0) is a point on a diameter of th...

If (a, 0) is a point on a diameter of the circle `x^2+y^2=4` then `x^2 -4x- a^2=0` has A) Exactly one real root in `(-1, 0]` B) Exactly one real root in `[2, 5]` C) Distinct roots greater than `-1` D) Distinct roots less than `5 `

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