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If A is the centre of the circle, x^2 + ...

If `A` is the centre of the circle, `x^2 + y^2 +2g_i x + 5 = 0` and `t_i` is the length of the tangent from any point to this circle, `i = 1, 2, 3,` then show that `(g_2 - g_3) t_1^2 +(g_3- g_1)t_2^2 + (g_1 - g_2) t_3^2 = 0`

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