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For making graph of equations |y|=|f(|x|...

For making graph of equations `|y|=|f(|x|)|` through `y=f(x)` which order of step is right among the following order of
Step `I : y=f(|x|)` (replace `x` by `|x|`)
Step `II : y=|f(x)|` (take modulus of `R.H.S`)
`Step `III : |y|=f(x)` (replace `y` by `|y|`)

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