$\frac{\cos 13^{\circ}-\sin 13^{\circ}}{\cos 13^{\circ}+\sin 13^{\circ}}+\frac{1}{\cot 148^{\circ}}$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $\frac{1}{2}$

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$\sin \frac{\pi}{14} \sin \frac{3\pi}{14} \sin \frac{5\pi}{14} \sin \frac{7\pi}{14} \sin \frac{9\pi}{14} \sin \frac{11\pi}{14} \sin \frac{13\pi}{14}$ નું મૂલ્ય કેટલું થાય?

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$\cos ^2 76^{\circ}+\cos ^2 16^{\circ}-\cos 76^{\circ} \cos 16^{\circ}$ ની કિંમત શોધો.

જો $\frac{\cos x}{a} = \frac{\cos (x + \theta)}{b} = \frac{\cos (x + 2\theta)}{c} = \frac{\cos (x + 3\theta)}{d}$ હોય,તો $\left( \frac{a + c}{b + d} \right)$ ની કિંમત શોધો:

જો $\cos(\theta - \alpha) = a$ અને $\sin(\theta - \beta) = b$ હોય, તો $\cos^2(\alpha - \beta) + 2ab \sin(\alpha - \beta) + \cos^2(\theta - \alpha)$ ની કિંમત શું થાય?

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