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syarat daerah asal --> g(x) ≥ 0
f(x)=√x²-4x²-4 ≥ 0
(x+2)(x-2) ≥ 0
x = -2 atau x = 2
+++++ - - - -- - - +++++ -->
-2 2
maka Df = {x| x ≤ -2 atau x ≥ 0, x∈ bil Real}