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If alpha,beta,gamma,delta be eccentric a...

If `alpha,beta,gamma,delta` be eccentric angles ofthe four concyclic points ofthe ellipse `x^2/a^2+y^2/b^2=1`, then `alpha+beta+gamma+delta=` (A) `(2n+1)pi/2` (B) `(2n-1)pi` (C) `2npi` (D) `npi`

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