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Question Number 176549 by doline last updated on 21/Sep/22

$$donnerlaformetrigonometriquede1/4(cos\mathrm{\Pi }/9+isin\mathrm{\Pi }/9)$$

Answered by Ar Brandon last updated on 21/Sep/22

$$\frac{1}{4(\cos \frac{\pi }{9}+i\sin \frac{\pi }{9})}=\frac{1}{4e^{\frac{\pi }{9}i}}=\frac{1}{4}{e}^{-\frac{\pi }{9}i}$$$$=\frac{1}{4}(\cos \frac{\pi }{9}-i\sin \frac{\pi }{9})$$

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