यदि $\frac{x}{\cos \alpha} = \frac{y}{\cos \left(\frac{2 \pi}{3} - \alpha\right)} = \frac{z}{\cos \left(\frac{2 \pi}{3} + \alpha\right)}$ है,तो $(x + y + z)$ का मान किसके बराबर है?

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

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सिद्ध कीजिए कि $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

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यदि $x + y = \frac{\pi}{4}$ है, तो $(1 + \tan x)(1 + \tan y) =$ का मान क्या होगा?

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