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If the circles (x+a)^(2) + (y + b)^(2) =...

If the circles `(x+a)^(2) + (y + b)^(2) = a^(2)` and `(x + c)^(2) + (y + d)^(2) = d^(2)` cut orthogonally, then b(b-2d) =

A

c(c - 2a)

B

c(2a - c)

C

d(2c - a)

D

a(a-2c)

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The correct Answer is:
B
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