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Consider an ellipse (x^(2))/25+(y^(2))/1...

Consider an ellipse `(x^(2))/25+(y^(2))/16=1` and `ABCD` be a quadrilateral circumscribing the ellipse. Let `S` be one of its focii, then `/_ASB+/_CSD=(3pi)/(lamda)` where `lamda` is_______

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