If x^2-2p x y-y^2=0 and x^2-2q x y-y^2=0...

If `x^2-2p x y-y^2=0` and `x^2-2q x y-y^2=0` bisect angles between each other, then find the condition.

`p=q+1`

`pq=-1`

`p+q+1=0`

`pq=2`

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