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The locus of a point on the variable par...

The locus of a point on the variable parabola `y^2=4a x ,` whose distance from the focus is always equal to `k ,` is equal to (`a` is parameter) (a)`4x^2+y^2-4k x=0` (b)`x^2+y^2-4k x=0` (c)`2x^2+4y^2-9k x=0` (d) `4x^2-y^2+4k x=0`

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