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sorry if this seems to be too easy for you, but I have struggled a lot with this expression and I don't get it how they got there:
How can sqrt(2x^2)$\sqrt{2x^2}$ become 4x^2$4x^2$ ?
How can sqrt(2x^2) become 4x^2 ?
How can $\sqrt{2x^2}$ become $4x^2$ ?