13^2 = x^2 + 400 + 2 * 20 * x * cos (y) , 17^2 = x^2+ 400 + 2 * 20 * x * sin ( y ) 13^2 = x^2 + 400 + 2 * 20 * x * cos (y) , 17^2 = x^2+ 400 + 2 * 20 * x * sin ( y )

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