If \(a_r=\cos \frac{2 r \pi}{9}+i \sin \frac{2 r \pi}{9}, r=1,2,3, \ldots ., i=\sqrt{-1}\), then....
If \(a_r=\cos \frac{2 r \pi}{9}+i \sin \frac{2 r \pi}{9}, r=1,2,3, \ldots ., i=\sqrt{-1}\), then the determinant \(\left|\begin{array}{lll}a_1 & a_2 & a_3 \\ a_4 & a_5 & a_6 \\ a_7 & a_8 & a_9\end{array}\right|\) is equal to: π²PW App Link - https://bit.ly/YTAI_PWAP πPW Website - https://www.pw.live
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