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JEEMAIN and NEET
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1999
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If the circle $x^2 +y^2 +2x -2y+4=0$ cuts the circle $x^2 +y^2 + 4x + 2fy+2=0$ orthogonally, then $f$ is equal to :
( A ) $1$
( B ) $-2$
( C ) $-1$
( D ) $2$
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