यदि $\frac{\sec 8\theta - 1}{\sec 4\theta - 1} = \frac{a + b\tan^2 2\theta}{1 + c\tan^2 2\theta + d\tan^4 2\theta}$ (जहाँ $\theta \neq \frac{n\pi}{16}, n \in I$),तो $(a - b + c - d)$ का मान है -

  • A
    $0$
  • B
    $1$
  • C
    $7$
  • D
    $13$

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${e^{{{\log }_{10}}\tan 1^\circ + {{\log }_{10}}\tan 2^\circ + {{\log }_{10}}\tan 3^\circ + ........... + {{\log }_{10}}\tan 89^\circ }}$ का मान क्या है?

$\frac{{\sin \theta }}{{1 - \cot \theta }} + \frac{{\cos \theta }}{{1 - \tan \theta }} = $

$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $ ($/16$ में)

यदि $\tan A = \frac{1}{2}$ और $\tan B = \frac{1}{3}$ है,तो $\cos 2A = $

यदि $\sin \theta_1 + \sin \theta_2 + \sin \theta_3 = 3$ है,तो $\cos \theta_1 + \cos \theta_2 + \cos \theta_3 = $

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