1.

If the circle x^(2)+y^(2)=a^(2) intersects the hyperbola xy=c^(2) in four points (x_(1),y_(1))" for "i=1,2,3 and" 4 then "y_(1)+y_(2)+y_(3)+y_(4) equals

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0
c
a
`c^4`

ANSWER :A


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