જો $(m + 2)\sin \theta + (2m - 1)\cos \theta = 2m + 1$ હોય,તો નીચેનામાંથી કયું સાચું છે?

  • A
    $\tan \theta = \frac{3}{4}$
  • B
    $\tan \theta = \frac{4}{3}$
  • C
    $\tan \theta = \frac{2m}{m^2 + 1}$
  • D
    આમાંથી કોઈ નહીં

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$\cos ^4 \frac{\pi}{12} + \cos ^4 \frac{5 \pi}{12} + \cos ^4 \frac{7 \pi}{12} + \cos ^4 \frac{11 \pi}{12} = $

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$\cos(18^{\circ}-A) \cdot \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cdot \cos(72^{\circ}+A)$ ની કિંમત શોધો.

જો $\cos x+\cos y=p$ અને $\sin x+\sin y=q$ હોય,તો $\cos \left(\frac{x-y}{2}\right) = $

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