$\frac{\cos 9^\circ + \sin 9^\circ}{\cos 9^\circ - \sin 9^\circ} = $

  • A
    $\tan 54^\circ$
  • B
    $\tan 36^\circ$
  • C
    $\tan 18^\circ$
  • D
    इनमें से कोई नहीं

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$\frac{\cos 10^o + \sin 10^o}{\cos 10^o - \sin 10^o} = $

$\tan 20^\circ + \tan 40^\circ + \sqrt{3} \tan 20^\circ \tan 40^\circ = $

यदि $\alpha, \beta, \gamma$ कोई भी तीन कोण हैं,तो $\cos \alpha + \cos \beta - \cos \gamma - \cos (\alpha + \beta + \gamma) =$

$\cos \alpha \sin (\beta - \gamma ) + \cos \beta \sin (\gamma - \alpha ) + \cos \gamma \sin (\alpha - \beta ) = $

यदि $A = \frac{\pi}{24}$ है,तो $\frac{\cos A + \cos 3A + \cos 5A + \cos 7A}{\sin A + \sin 3A + \sin 5A + \sin 7A} = $

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