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[" Let "f(x)=|x-1|." Then,"],[[" (a) "f(...

[" Let "f(x)=|x-1|." Then,"],[[" (a) "f(x^(2))=[f(x)]^(2)," (b) "f(|x|)=|f(x)|],[" (c) "f(x+y)=f(x)+f(y)," (d) none of these "]]

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