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[" 10.If "z=1+cos(pi)/(5)+i sin(pi)/(5),...

[" 10.If "z=1+cos(pi)/(5)+i sin(pi)/(5)," then "sin(arg z)" is equal "6],[qquad [" a."(sqrt(10-2sqrt(5)))/(4)" b."(sqrt(5)-1)/(4)," c."(sqrt(5)+1)/(4)]]

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