$\cos 255^o + \sin 195^o$ નું મૂલ્ય શું છે?

  • A
    $\frac{\sqrt{3} - 1}{2\sqrt{2}}$
  • B
    $\frac{\sqrt{3} - 1}{\sqrt{2}}$
  • C
    $-\frac{\sqrt{3} - 1}{\sqrt{2}}$
  • D
    $\frac{\sqrt{3} + 1}{\sqrt{2}}$

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

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