1. Resolve z^5 + 1 into linear factors with real coefficients.
Hence deduce that 4sin(
![\frac{\pi}{10?} \frac{\pi}{10?}](https://tex.z-dn.net/?f=+%5Cfrac%7B%5Cpi%7D%7B10%3F%7D+)
COS(
![\frac{\pi}{5 ?} = 1 \frac{\pi}{5 ?} = 1](https://tex.z-dn.net/?f=+%5Cfrac%7B%5Cpi%7D%7B5+%3F%7D++%3D+1)
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I don't know happy teddy day
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