જો $\cos 40^\circ = x$ અને $\cos \theta = 1 - 2x^2$ હોય,તો $0^\circ$ અને $360^\circ$ ની વચ્ચે $\theta$ ના શક્ય મૂલ્યો કયા છે?

  • A
    $100^\circ$ અને $260^\circ$
  • B
    $80^\circ$ અને $280^\circ$
  • C
    $280^\circ$ અને $110^\circ$
  • D
    $110^\circ$ અને $260^\circ$

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