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I have posted a link there to this thread so the OP can view my work.The sum of the lengths of the tangents from a point P to the circumferences...?

The sum of the lengths of the tangents from a point P to the circumferences:

C1 : x² + y² = 4

and

C2 : x² + y² = 9

is constant and equal to 5.

Determine the locus of the point P.

Explain.

Thanks.