If \( S^{\prime} \) and \( S \) are the foci of the ellipse \( \fra...

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If \( S^{\prime} \) and \( S \) are the foci of the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1 \) and
P
W \( P(x, y) \) a point on it, the value of \( S P+S^{\prime} P \) is:
(1) \( 2 b \)
(2) \( 2 a \)
(3) \( a-b \)
(4) \( a+b \)
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