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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$\cos 24^{\circ} + \cos 55^{\circ} + \cos 155^{\circ} + \cos 204^{\circ}$ નું મૂલ્ય શું છે?

$\sin 600^\circ \cos 330^\circ + \cos 120^\circ \sin 150^\circ$ ની કિંમત શોધો.

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