1.

If the normal at the point P(x_1y_1),i=1.2,3,4 on the hyperbola xy=c^2 are concurrent at the point Q(h, k), then ((x_1+x_2+x_3+x_4)(y_1+y_2+y_3+y_4))/(x_1x_2x_3x_4) is:

Answer»

`(HK)/(c^2)`
`(hk)/(c^4)`
`-(hk)/(c^2)`
`-(hk)/(c^4)`

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