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The locus of the midpoint of a chord of ...

The locus of the midpoint of a chord of the circle `x^(2)+y^(2) = 4` which subtends a right angle at the origin is

A

`x+y=1`

B

`x+y=2`

C

`x^(2)+y^(2)=1`

D

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

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The correct Answer is:
D
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