समीकरण $\frac{3 \cos 2x + \cos^3 2x}{\cos^6 x - \sin^6 x} = x^3 - x^2 + 6$ के हलों $x \in R$ का योग क्या है?

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $3$

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