## For any integer k, let $\alpha_k=cos\frac{k\pi}{7}+isin\frac{k\pi}{7}$ where i=$\sqrt(-1)$ then value of the expression $\frac{\sum_{k=1}^{12}|\alpha_{k+1}-\alpha_k|}{\sum_{k=1}^{3}|\alpha_{4k-1}-\alpha_{4k-2}|}$

• April 5, 2021
This video is created for the students of class xii. This video is helpful for those who is taking preparation for IIT JEE examination. In this video the following question( Taken from question paper JEE ADVANCED ) has been discussed For any integer k, let $$\alpha_k=cos\frac{k\pi}{7}+isin\frac{k\pi}{7}$$ where i=$$\sqrt(-1)$$ then value of the expression $$\frac{\sum_{k=1}^{12}|\alpha_{k+1}-\alpha_k|}{\sum_{k=1}^{3}|\alpha_{4k-1}-\alpha_{4k-2}|}$$