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If P(alpha,beta) is a point on the ell...

If `P(alpha,beta)` is a point on the ellipse `(x^2)/(a^2)+(y^2)/(b^2)=1` with foci `S a n d S '` and eccentricity `e ,` then prove that the area of Δ` S P S '` is `be sqrt(a^2-alpha^2)`

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