$\tan \frac{2\pi}{5} - \tan \frac{\pi}{15} - \sqrt{3} \tan \frac{2\pi}{5} \tan \frac{\pi}{15}$ ની કિંમત શોધો.

  • A
    $-\sqrt{3}$
  • B
    $\frac{1}{\sqrt{3}}$
  • C
    $1$
  • D
    $\sqrt{3}$

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જો $\sin \theta = \frac{-12}{13}$,$\cos \phi = \frac{-4}{5}$ અને $\theta, \phi$ ત્રીજા ચરણમાં હોય,તો $\tan(\theta - \phi) =$

$\cos ^4 \frac{\pi}{24} - \sin ^4 \frac{\pi}{24} = $

જો $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ અને $0 \leq \alpha \leq \frac{\pi}{2}$ હોય,તો $\cos 2 \theta$ ની કિંમત શોધો.

જો $A=35^{\circ}, B=15^{\circ}$ અને $C=40^{\circ}$ હોય,તો $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ ની કિંમત શોધો.

સાબિત કરો કે $\cot 4x(\sin 5x + \sin 3x) = \cot x(\sin 5x - \sin 3x)$

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