यदि $\sin \alpha - \cos \alpha = m$ और $\sin 2 \alpha = n - m^2$,जहाँ $-\sqrt{2} \leq m \leq \sqrt{2}$ है,तो $n$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $-2$

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