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If Sa n dS ' ' are the foci of the elli...

If `Sa n dS ' '` are the foci of the ellipse `(x^2)/(25)+(y^2)/(16)=1` , and `P` is any point on it, then the range of values of `S PdotS ' P` is (a)`9lt=f(theta)lt=16` (b) `9lt=f(theta)lt=25` (c)`16lt=f(theta)lt=25` (d) `1lt=f(theta)lt=16`

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