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Algebra Level 2

Which of the following equations about absolute value function is/are true for real values of xx?

A. x={x,x0x,x<0|x| =\begin{cases} x &, x \geq 0 \\ -x & , x<0 \end{cases} .

B. x=max{x,x}|x|=\max \{ x, -x \} .

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