यदि $\sin \theta + \cos \theta = x$ है,तो ${\sin ^6}\theta + {\cos ^6}\theta = \frac{1}{4}[4 - 3{({x^2} - 1)^2}]$ के लिए

  • A
    सभी वास्तविक $x$
  • B
    ${x^2} \le 2$
  • C
    ${x^2} \ge 2$
  • D
    इनमें से कोई नहीं

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