$\sin ^{6} \theta+\cos ^{6} \theta$ is equal to

  • A
    $1+3 \sin ^{2} \theta \cos ^{2} \theta$
  • B
    $1$
  • C
    $1-3 \sin ^{2} \theta \cos ^{2} \theta$
  • D
    $1-3 \sin \theta \cos \theta$

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