$\cos 255^o + \sin 195^o$ का मान क्या है?

  • 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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$\cos 24^{\circ} + \cos 55^{\circ} + \cos 125^{\circ} + \cos 204^{\circ} + \cos 300^{\circ}$ का मान है

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