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f(-x) = -f(x)
2(-x) = -(2x)
-2x = -2x
jadi, f(-x) = -f(x)
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untuk f (x) = x²
f(-x) = -f(x)
(-x)² = -(x)²
x² = -x²
Jadi, f(-x) tidak sama dengan -f(x)