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Show that the circles x^(2) + y^(2) - 8x...

Show that the circles `x^(2) + y^(2) - 8x - 4y - 16 = 0` and `x^(2) + y^(2) - 2x + 4y + 4 = 0` touch each other internally and find the coordinates of their point of contact.

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