If the intercepts of the variable circle on the \( x \)-axis and \( y \)-axis are 3 units and 7 ....

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If the intercepts of the variable circle on the \( x \)-axis and
\( \mathrm{P} \)
\( y \)-axis are 3 units and 7 units respectively, then the locus of the center of the variable circle is
(1) \( y^{2}-x^{2}=3 \)
(2) \( y^{2}-x^{2}=5 \)
(3) \( y^{2}-x^{2}=6 \)
(4) \( y^{2}-x^{2}=10 \)


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