$n \in Z^{+}$ માટે,$(1+\sin \theta+i \cos \theta)^n+(1+\sin \theta-i \cos \theta)^n=$

  • A
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cos \left(\frac{n \pi}{4}-\frac{\theta}{2}\right)$
  • B
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cdot \sin \left(\frac{n \pi}{4}-\frac{\theta}{2}\right)$
  • C
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \cos \left(\frac{n \pi}{4}-\frac{n \theta}{2}\right)$
  • D
    $2^{n+1} \cdot \cos ^n\left(\frac{\pi}{4}-\frac{\theta}{2}\right) \sin \left(\frac{n \pi}{4}-\frac{n \theta}{2}\right)$

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