જો $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right)$ હોય,તો:

  • A
    $x + y + z = 0$
  • B
    $xy + yz + zx = 0$
  • C
    $xyz + x + y + z = 1$
  • D
    આમાંથી કોઈ નહીં

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$\cos 20^{\circ} \cos 40^{\circ} \cos 60^{\circ} \cos 80^{\circ} = $

$2 \sin^2 \beta + 4 \cos(\alpha + \beta) \sin \alpha \sin \beta + \cos 2(\alpha + \beta) = $

જો $\tan A+\tan B+\cot A+\cot B=\tan A \tan B-\cot A \cot B$ અને $0^{\circ} < A+B < 270^{\circ}$ હોય,તો $A+B=$ ($^{\circ}$ માં)

$\frac{1}{4} \tan \frac{\pi}{8} + \frac{1}{8} \tan \frac{\pi}{16} + \frac{1}{16} \tan \frac{\pi}{32} + \dots \infty$ પદોનું મૂલ્ય કેટલું થાય?

$\sin\,10^o \sin\,30^o \sin\,50^o \sin\,70^o$ ની કિંમત શોધો.

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