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

  • A
    $1$
  • B
    $0$
  • C
    $-1$
  • D
    આમાંથી કોઈ નહીં

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$\cos y \cos \left( \frac{\pi}{2} - x \right) - \cos \left( \frac{\pi}{2} - y \right) \cos x + \sin y \cos \left( \frac{\pi}{2} - x \right) + \cos x \sin \left( \frac{\pi}{2} - y \right)$ ની કિંમત શૂન્ય થાય,જો

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$0 \le \alpha_1, \alpha_2, \dots, \alpha_n \le \frac{\pi}{2}$ અને $\cot \alpha_1 \cdot \cot \alpha_2 \cdots \cot \alpha_n = 1$ ની શરતો હેઠળ $\cos \alpha_1 \cdot \cos \alpha_2 \cdots \cos \alpha_n$ નું મહત્તમ મૂલ્ય શું છે?

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