$1 + \cos 2x + \cos 4x + \cos 6x = $

  • A
    $2\cos x \cos 2x \cos 3x$
  • B
    $4\sin x \cos 2x \cos 3x$
  • C
    $4\cos x \cos 2x \cos 3x$
  • D
    આમાંથી કોઈ નહીં

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Similar Questions

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

$2 \cosh (x+y) \sinh (x-y) + \sinh 2y =$

જો $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ અને $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ હોય,તો:

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

જો $2 \sin \left(\theta+\frac{\pi}{3}\right)=\cos \left(\theta-\frac{\pi}{6}\right)$ હોય,તો $\tan \theta$ ની કિંમત શોધો.

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