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Ajutorrr!!!
calculati :
cos( 2 arcsin 1/3)=


Răspuns :

[tex]cos(2arcsin \frac{1}{3} ) = 1 - 2 {sin}^{2} (arcsin( \frac{1}{3} )) = 1 - 2 ({ \frac{1}{3} })^{2} = \frac{7}{9} [/tex]