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

. The lines `(a+b)x + (a-b) y-2ab=0, (a-b)x+(a+b)y-2ab = 0 and x+y=0` form an isosceles triangle whose vertical angle is (1) `pi/2` (2) `tan^-1 ((2ab)/(a^2-b^2))` (3) `tan^-1 (a/b)` (4) `2 tan^-1 (a/b)`

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