$\cos 15^\circ - \sin 15^\circ$ નું મૂલ્ય કેટલું થાય?

  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{\sqrt{2}}$
  • D
    $0$

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$\cos \frac{\pi}{10} \cos \frac{2\pi}{10} \cos \frac{4\pi}{10} \cos \frac{8\pi}{10} \cos \frac{16\pi}{10}$ નું મૂલ્ય શું છે?

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