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Prove that the circles x ^ 2 + y ^ 2 + 10x - 4y - 3 = 0 and x ^ 2 + y

Prove that the circles x ^ 2 + y ^ 2 + 10x - 4y - 3 = 0 and x ^ 2 + y ^ 2 - 2x - 6y + 5 = 0 orthogonal

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