$\tan 5^{\circ} \cdot \tan 25^{\circ} \cdot \tan 45^{\circ} \cdot \tan 65^{\circ} \cdot \tan 85^{\circ}$ ની કિંમત $\ldots \ldots \ldots \ldots$ છે.

  • A
    $3$
  • B
    $2$
  • C
    $1$
  • D
    $0$

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સાબિત કરો કે $\tan ^{4} \theta+\tan ^{2} \theta=\sec ^{4} \theta-\sec ^{2} \theta$

જો $0 < \theta < 90$ અને $\sin \theta = \cos 30$ હોય,તો $2 \tan^2 \theta - 1 = \dots$

$\tan 23^{\circ} \tan 42^{\circ} \tan 48^{\circ} \tan 67^{\circ} = \ldots \ldots \ldots \ldots .$

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

$(1+\tan ^{2} \theta)(1-\sin \theta)(1+\sin \theta)$ નું સાદું રૂપ આપો.

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