જો $A = \frac{\pi}{24}$ હોય,તો $\frac{\cos A + \cos 3A + \cos 5A + \cos 7A}{\sin A + \sin 3A + \sin 5A + \sin 7A} = $

  • A
    $\sqrt{3}$
  • B
    $2\sqrt{3}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    $\frac{2}{\sqrt{3}}$

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જો $\cos (A - B) = \frac{3}{5}$ અને $\tan A \tan B = 2$ હોય,તો

જો $\tan \theta = \frac{\cos 25^{\circ} + \sin 25^{\circ}}{\cos 25^{\circ} - \sin 25^{\circ}}$ અને $\theta$ ત્રીજા ચરણમાં હોય,તો $\theta =$ ($^{\circ}$ માં)

જો $\frac{x}{\cos \alpha} = \frac{y}{\cos \left(\frac{2 \pi}{3} - \alpha\right)} = \frac{z}{\cos \left(\frac{2 \pi}{3} + \alpha\right)}$ હોય,તો $(x + y + z)$ ની કિંમત કેટલી થાય?

સાબિત કરો કે $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

$\cos 48^{\circ} \cdot \cos 12^{\circ} = ?$

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