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Cum se calculeaza: [tex]\sqrt{a+ \sqrt{b}} =?[/tex]

Răspuns :

[tex]Este~formula~radicalilor~dubli~(compusi). \\ \\ Daca~ \boxed{c= \sqrt{a^2-b}},~atunci~ \boxed{ \sqrt{a \pm \sqrt{b}}= \sqrt{\frac{a+c}{2} } \pm \sqrt{\frac{a-c}{2}} } ~.[/tex]