$\frac{(\cos a+i \sin a)^6}{(\sin b+i \cos b)^8}$ નો વાસ્તવિક ભાગ શોધો.

  • A
    $\sin (6 a-8 b)$
  • B
    $\cos (6 a-8 b)$
  • C
    $\sin (6 a+8 b)$
  • D
    $\cos (6 a+8 b)$

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