[tex] 4 = \sqrt {4*4} = \sqrt {4*4*i^4} =\sqrt {i^2*4 *4*i^2} [/tex](adsbygoogle = window.adsbygoogle || []).push({});

[tex] = i\sqrt{4}*i\sqrt{4} =2i*2i =-4[/tex]

this is wrong but which setp

=)

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# Beware the complex number

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