1.

Focii of the curve xy = -4 are

Answer»

` (SQRT2, -sqrt2 ) (-sqrt2, - sqrt2) `
` (2SQRT2 , -2sqrt2) , ( -2sqrt2, -2sqrt2) `
` (-2sqrt2, 2sqrt2) , ( 2sqrt2,-2sqrt2) `
` (-SQRT3, sqrt3)(sqrt3,-sqrt3) `

ANSWER :C


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