Tle tangent and normal at a point \( P \) on the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{...

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Tle tangent and normal at a point \( P \) on the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1 \) meets the minor axis is \( A \) and \( B . S \) and \( S^{\prime} \) are the foci of the - ellipse, then find \( \angle A P B+\angle A S B+\angle A S^{\prime} B \).
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