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

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

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$\frac{\cos (90^{\circ}- A ) \sin (90^{\circ}- A )}{\tan (90^{\circ}- A )}$ નું સાદું રૂપ ....... છે.

જો $\sin 5 \theta = \cos 5 \theta$ હોય,તો $\theta$ ની કિંમત .......... છે.

$\frac{\sec \theta-1}{\sec \theta+1} = \ldots$

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