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The lines (a+b)x+(a-b)y-2ab=0, (a-b)x+...

The lines `(a+b)x+(a-b)y-2ab=0`,
`(a-b)x+(a+b)y-2ab=0` and `x+y=0` form and isosceles triangle whose vertical angle is `2tan^(-1)(b/a)`.

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