If a ,\ b ,\ c are real numbers, then fi...

If `a ,\ b ,\ c` are real numbers, then find the intervals in which `f(x)=|(x+a^2,a b, a c),( a b, x+b^2,b c),( a c, b c, x+c^2)|` is increasing or decreasing.

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The correct Answer is:

`(-2/3(a^2+b^2+c^2),0)`

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