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The common chord of x^2+y^2-4x-4y=0 and ...

The common chord of `x^2+y^2-4x-4y=0` and `x^2+y^2=16` subtends at the origin an angle equal to

A

`pi/6`

B

`pi/4`

C

`pi/3`

D

`pi/2`

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