यदि $\cos \theta + \cos 7\theta + \cos 3\theta + \cos 5\theta = 0$ है,तो $\theta$ का मान ज्ञात कीजिए:

  • A
    $\frac{n\pi}{4}$
  • B
    $\frac{n\pi}{2}$
  • C
    $\frac{n\pi}{8}$
  • D
    इनमें से कोई नहीं

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यदि $\sin \theta + \sin^2 \theta = 1$ और $\cos^{12} \theta + a \cos^{10} \theta + b \cos^8 \theta + c \cos^6 \theta + d = 0$ है,तो:

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