यदि $\alpha_1, \alpha_2, \alpha_3, \ldots, \alpha_n$ वास्तविक संख्याएँ हैं,$\alpha_1 \neq 0$ और $z = \cos \theta + i \sin \theta$ समीकरण $\alpha_1 + \alpha_2 z + \alpha_3 z^2 + \ldots + \alpha_n z^{n-1} + z^n = 0$ का एक मूल है,तो $\alpha_1 \cos n \theta + \alpha_2 \cos (n-1) \theta + \ldots + \alpha_n \cos \theta =$

  • A
    $1+i$
  • B
    $1$
  • C
    $-1$
  • D
    $1-i$

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