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A point P moves such that it is at a c...

A point P moves such that it is at a constant distance `c` from the origin. If Q is the image of P in the line mirror `y=x` and R is the image of Q in the line mirror `y= x` then locus of R is
(a)`y^2=x^2` (b) `x^2+y^2=2c^2` (c)`x y=c^2` (d) `x^2+y^2=c^2`

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