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If the two lines (3x-y)^(2)=k(x^(2)+y^(2...

If the two lines `(3x-y)^(2)=k(x^(2)+y^(2))` are mutualy perpendiculart then: `k=`

A

`5`

B

`6`

C

`-5`

D

`-6`

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