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A variable line passes through the fixed...

A variable line passes through the fixed point `(alpha,beta)`. The locus of the foot of the perpendicular from the origin on the line is

A

`x^2+y^2-alphax-betay=0`

B

`x^2+y^2+2alphax+2betay=0`

C

`alphax+betay+-sqrt((alpha^2+beta^2))=0`

D

`x^2/alpha^2+y^2/beta^2=1`

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