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यदि theta in [pi//6,pi//3],i=1,2,3,4,5 त...

यदि `theta in [pi//6,pi//3],i=1,2,3,4,5` तथा `z^(4)cos theta_(1)+z^(3)cos theta_(2)+z^(2)cos theta_(3)+z cos theta_(4)+cos theta_(5)=2sqrt(3)` हो तो प्रदर्शित कीजिए `|z|gt3/4` है।

लिखित उत्तर

Verified by Experts

The correct Answer is:
`=>4|z|gt3`
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