$\sum_{k=1}^6\left(\sin \frac{2 \pi k}{7}-i \cos \frac{2 \pi k}{7}\right)=$

  • A
    -$1$
  • B
    $0$
  • C
    $i$
  • D
    $-i$

Explore More

Similar Questions

$\frac{(\sin \frac{\pi}{8} + i \cos \frac{\pi}{8})^8}{(\sin \frac{\pi}{8} - i \cos \frac{\pi}{8})^8}$ ની કિંમત શોધો.

જો $z = \frac{\sqrt{3} + i}{2}$ હોય,તો $z^{69}$ ની કિંમત શું થાય?

જો $\theta = \frac{\pi}{6}$ હોય,તો શ્રેણી $1 + (\cos \theta + i \sin \theta) + (\cos \theta + i \sin \theta)^2 + (\cos \theta + i \sin \theta)^3 + \ldots$ નું $10$ મું પદ શું થાય?

જો એકમના ઘનમૂળ $1, \omega, \omega^2$ હોય,તો સમીકરણ $(x - 1)^3 + 8 = 0$ ના બીજ કયા છે?

$\sqrt{i} = $

Difficult
View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo