1.

A circle C_1 is drawn having any point P on x-axis as its centre and passingthrough the centre of the circle (C )x^2+y^2=1 . A commontangent to C_1 to C intersects the circle at Q and R respectively. Then Q(x,y) always satisfies

Answer»

`x^2-1=0`
`x^2+y^2=1`
`y^2-1=0`
NONE of these

ANSWER :A


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