If `n=5` in (i), then value of `(z +1)(z^2-2z cos(pi/5)+1) (z^2 + 2z cos(2pi/5)+1)` is :

If z_(0), z_(1),z_(2),...,z_(5) be 6^(th) roots of unity where z_(0)=1 then the value of (1)/(3)(2+z_(1))(2+z_(2))...(2+z_(5)) is...

If z= cos((8pi)/11)+isin((8pi)/11),i=sqrt(-1) then the value of Re(z+z^2+z^3+z^4+z^5) is lambda then 20lambda^2 =

If arg(z)=-pi/4 then the value of arg((z^5+(bar(z))^5)/(1+z(bar(z))))^n is

If arg(z)=-(pi)/(4) then the value of arg((z^(5)+(bar(z))^(5))/(1+z(bar(z))))^(n) is

For a complex number z, if arg(z) in (-pi, pi], then arg(1+cos.(6pi)/(5)+I sin.(6pi)/(5)) is (here i^(2)-1 )

For a complex number z, if arg(z) in (-pi, pi], then arg(1+cos.(6pi)/(5)+I sin.(6pi)/(5)) is (here i^(2)-1 )

If | (z - i)/(z + 2i)| = 1, |z| = 5/2 then the value of |z + 3i|

If | (z - i)/(z + 2i)| = 1, |z| = 5/2 then the value of |z + 3i|

If | (z - i)/(z + 2i)| = 1, |z| = 5/2 then the value of |z + 3i|

If z_(1) = 2+ 3i and z_(2) = 5-3i " then " z_(1)z_(2) is