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[" 18If "z=1+cos((pi)/(5))+1sin((pi)/(5)...

[" 18If "z=1+cos((pi)/(5))+1sin((pi)/(5))" ,then (ain(arg(z))) is equal to "],[[" (a) "sqrt((10-2sqrt(5))/(4))," (b) "(sqrt(5)-1)/(4)],[" (c) "(sqrt(5)+1)/(4)," (d) None of these "]]

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