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= (-√2,√2)
jika r = √6 maka persamaannya sebagai berikut:
(x-(-√2))²+(y-√2)²=(√6)²
(x+√2)²+(y-√2)²=6
x² + 2√2 x + 2 + y² - 2√2 y + 2 = 6
x² + y² + 2√2 x - 2√2 y + 4 = 6
x² + y² + 2√2 x - 2√2 y + 4 - 6 = 0
x² + y² + 2√2 x - 2√2 y - 2 = 0