$\cos^{3}\left(\frac{\pi}{8}\right) \cdot \cos\left(\frac{3\pi}{8}\right) + \sin^{3}\left(\frac{\pi}{8}\right) \cdot \sin\left(\frac{3\pi}{8}\right)$ ની કિંમત શોધો.

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\frac{1}{2\sqrt{2}}$
  • D
    $\frac{1}{2}$

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