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OpenStudy (anonymous):
if z is the non real fifth root of unity then the value of ^(l 1+z+z^2+z^-2+z^-1l)=?
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OpenStudy (anonymous):
its find the value of 2^(l1+z+z^2+z^-2-z^-1l) sry i wrote it wrong
OpenStudy (goformit100):
is it IIT question ?
OpenStudy (anonymous):
yup
OpenStudy (anonymous):
you can use z+z^2+z^3+z^4=0 for z=fifth root of unity
OpenStudy (goformit100):
Show your working.
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hartnn (hartnn):
so you know how to solve it already
OpenStudy (anonymous):
|dw:1389460828114:dw| what next
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