કોઈપણ $\theta \in \left( \frac{\pi}{4}, \frac{\pi}{2} \right)$ માટે,પદાવલિ $3(\sin \theta - \cos \theta)^4 + 6(\sin \theta + \cos \theta)^2 + 4\sin^6 \theta$ ની કિંમત શું થાય?

  • A
    $13 - 4\cos^2 \theta + 6\sin^2 \theta \cos^2 \theta$
  • B
    $13 - 4\cos^6 \theta$
  • C
    $13 - 4\cos^2 \theta + 6\cos^4 \theta$
  • D
    $13 - 4\cos^4 \theta + 2\sin^2 \theta \cos^2 \theta$

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$\tan 20^{\circ} + \tan 40^{\circ} + \tan 60^{\circ} + \cdots + \tan 180^{\circ}$ નું મૂલ્ય કેટલું છે?

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