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[f" is defined in "[-5,5]" as "],[f(x)=x...

[f" is defined in "[-5,5]" as "],[f(x)=x" if "x" is rational "],[qquad =-x" if "x" is irrational.Then "],[" (A) "f(x)" is continuous at every "x" ,except "],[x=0],[" (B) "f(x)" is discontinuous at every "x" ,"],[" except "x=0],[" (C) "f(x)" is continuous everywhere "],[" D) "f(x)" is discontinuous everywhere "]

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