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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$\cos ^2 48^{\circ}-\sin ^2 12^{\circ} = $ . . . . . . ,જો $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ હોય તો.

સાબિત કરો કે $\frac{\cos 9x - \cos 5x}{\sin 17x - \sin 3x} = -\frac{\sin 2x}{\cos 10x}$

જો $\sin (A+B) \sin (A-B)+\cos (A+B) \cos (A-B)=\frac{1}{2}$ અને $0 < B < \frac{\pi}{2}$ હોય,તો $B=$

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

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