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Let S and S'' be the fociof the ellipse ...

Let S and S'' be the fociof the ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2))=1` whose eccentricity is i.e. P is a variable point on the ellipse. Consider the locus the incenter of `DeltaPSS''`
The eccentricity of the locus oc the P is

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