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———> L = (-y)^2 + (-x)^2 + 10(-y) - 6(-x) - 30
L = y^2 + x^2 - 10y + 6x - 30
L = x^2 + y^2 + 6x - 10y - 30
Sayarat pencerminan y=-x
Variabel x diganti -y
Variabel y diganti -x
Maaf yaaa kalau salah, semoga membantu ^_^