If $\tan ^{2} \theta = \sin ^{2} \theta + \cos ^{2} \theta$,then $\theta = \ldots$ (in $^{\circ}$)

  • A
    $90$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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Prove that $\sin^{6} \theta + \cos^{6} \theta + 3 \sin^{2} \theta \cos^{2} \theta = 1$.

$5 \cos A = 4 \sin A$,then $\tan A = \ldots$

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