[" Triangle formed by variable lines "(a+b)x+(a-b)y-2ab=0],[" and "(a-b)x+(a+b)y-2ab=0" and "x+y=0" is (where "a,b in R)]

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

. 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

. 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

. 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

Find the angle between the st. Lines : (a+b)x+(a-b)y=2ab and (a-b)x+(a+b)y=2ab

Two sides of a triangle are the lines (a+b)x+(a-b)y-2ab=0 and (a-b)x+(a+b)y-2ab=0 . If the triangle is isosceles and the third side passes through point (b-a,a-b) then the equation of third side can be :

The lines (a+b)x+(a-b)y=2ab, (a-b)x +(a+b)y=2ab , and x+y=0 form an isosceles triangles whose vertical angle is

Two sides of a triangle are (a + b) x + (a-b)y-2ab = 0 and (a-b)x + (a + b)y-2ab = 0 . If the triangle is isosceles and the third side passes through point (b- a, a -b) , then the equation of third side can be

Two sides of a triangle are (a + b) x + (a-b)y-2ab = 0 and (a-b)x + (a + b)y-2ab = 0 . If the triangle is isosceles and the third side passes through point (b- a, a -b) , then the equation of third side can be

. 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)