if S and S are two foci of an ellips...

if S and S are two foci of an ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2))=1` (`altb`) and `P(x_(1) , y_(1))` a point on it then SP+ S'P is equal to

`a+ex_(1)`

`b+ey_(1)`

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