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Find the locus of the midpoint of the ch...

Find the locus of the midpoint of the chords of the circle `x^2+y^2=a^2` which subtend a right angle at the point `(c ,0)dot`

A

`x^(2) + y^(2) = 3 a^(2)`

B

`x^(2) + y^(2) = (a^(z))/(3)`

C

`2x^(2) + y^(2) = a^(2) `

D

`4x^(2) + y^(2) = a^(2)`

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