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pusat bearti (2, -2)
(x-a )^2 + (y-b)^2 = r^2
(x-2)^2 + (y+2)^2 = 1^2
×^2-4x+4 + y^2+4y+4 =1
x^2 +y^2 -4x+4y+8 =1
×^2 +y^2 -4×+ 4y = -7