જો $\cos 43^{\circ} + \sin 43^{\circ} = k$ હોય, તો $\cos 2^{\circ}$ ની કિંમત શોધો.

  • A
    $\frac{k}{\sqrt{2}}$
  • B
    $\frac{\sqrt{2}}{k}$
  • C
    $\frac{\sqrt{2}}{k\sqrt{3}}$
  • D
    $\frac{k}{\sqrt{3}}$

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