यदि $P = \sin \frac{2 \pi}{7} + \sin \frac{4 \pi}{7} + \sin \frac{8 \pi}{7}$ और $Q = \cos \frac{2 \pi}{7} + \cos \frac{4 \pi}{7} + \cos \frac{8 \pi}{7}$ है,तो बिंदु $(P, Q)$ किस त्रिज्या वाले वृत्त पर स्थित है?

  • A
    $1$
  • B
    $0$
  • C
    $2$
  • D
    $4$

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