1.∑k=16[sin2kπ7−icos2kπ7]\sum_{k=1}^{6} \left[ \sin \frac{2k\pi}{7} - i \cos \frac{2k\pi}{7} \right]∑k=16[sin72kπ−icos72kπ] is equal toa.−1-1−1b.000c.−i-i−id.iiiLogin to continueOnly logged in users canattempt or see the solution.
