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

  • A
    $\frac{1}{20}$
  • B
    $\frac{1}{4}$
  • C
    $\frac{4}{5}$
  • D
    $\frac{5}{4}$

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$\tan ^{2} \theta - \sec ^{2} \theta = \ldots \ldots \ldots$

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The value of $(\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ})$ is

$\cot \theta \cdot \tan \theta = \dots$

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