यदि $\sin \alpha + \cos \alpha = m$ है,तो $\sin^6 \alpha + \cos^6 \alpha = $

  • A
    $\frac{4+3(m^2-1)^2}{4}$
  • B
    $\frac{4-3(m^2-1)^2}{4}$
  • C
    $\frac{3+4(m^2-1)^2}{4}$
  • D
    $\frac{4-3(m^2+1)^2}{4}$

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$INCORRECT$ (गलत) कथन चुनिए।

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जब $\frac{\sin 9 \theta}{\cos 27 \theta}+\frac{\sin 3 \theta}{\cos 9 \theta}+\frac{\sin \theta}{\cos 3 \theta}=k(\tan 27 \theta-\tan \theta)$ परिभाषित है,तब $k=$

$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} + \cos^2 \frac{5\pi}{12}$ का मान ज्ञात कीजिए।

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