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Given two straight lines AB and AC whose...

Given two straight lines `AB` and `AC` whose equations are `3x + 4y = 5` and `4x - 3y = 5` respectively.Then, the possible equation of line `BC` through `(1, 2),` such that `AABC` is isosceles, is `l, = 0` and `l_2, = 0,` then answer the following questions :1.If `I_1 = ax + by+c= 0` and `l_2 = dx + ey + f = 0` where `a, b, c, d, e, f in I` and `a, d gt 0,` then `c + f` is

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