જો $\tan \theta = \frac{\cos 15^{\circ} + \sin 15^{\circ}}{\cos 15^{\circ} - \sin 15^{\circ}}$ હોય,તો $\theta =$

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{\pi}{3}$
  • C
    $\frac{\pi}{6}$
  • D
    $\frac{\pi}{2}$

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જો $\cos \theta = \frac{3}{5}$ અને $\cos \phi = \frac{4}{5}$ હોય,જ્યાં $\theta$ અને $\phi$ ધન લઘુકોણ છે,તો $\cos \frac{\theta - \phi}{2} = $

$\tan 5^{\circ} \tan 25^{\circ} \tan 45^{\circ} \tan 65^{\circ} \tan 85^{\circ} = $

$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

$\sin \theta + \cos \theta$ નું મૂલ્ય ક્યારે મહત્તમ હશે?

જો $\tan \theta = t$ હોય,તો $\tan 2\theta + \sec 2\theta = $

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