જો $\sin \alpha + \cos \alpha = m$ હોય,તો $\sin^6 \alpha + \cos^6 \alpha = $

  • A
    $\frac{4+3(m^2-1)^2}{4}$
  • B
    $\frac{4-3(m^2-1)^2}{4}$
  • C
    $\frac{3+4(m^2-1)^2}{4}$
  • D
    $\frac{4-3(m^2+1)^2}{4}$

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