$\cos 255^o + \sin 195^o$ 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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