show that the points A(1,-1,-5), B(3,1,3) and C(9,1,-3) are the vertices of an equilateral triangle.

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show that the points A(1,-1,-5), B(3,1,3) and C(9,1,-3) are the vertices of an equilateral triangle.
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Please solve this question

Show that the point (1, 1), (root3-root3),and(-1,-1)are the vertices of an equilateral triangle

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So u please make a video on this question

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