Drawing function like: sqrt(x^4 -4x^2 +2)?

Amiras

New member
Drawing function sqrt(x^4 -4x^2 +2), would be the same like x^4 -4x^2 +2, just not crossing y=0, but how can i draw function like x^4 -4x^2 +2, what aspects should I look after? Please answer with details.
 
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