यदि $2 \cos^{2} \theta + 3 \cos \theta = 2$ है,तो $\cos \theta$ का अनुमेय (permissible) मान क्या है?

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

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