$\Delta ABC$ में,${b^2}\cos 2A - {a^2}\cos 2B = $

  • A
    ${b^2} - {a^2}$
  • B
    ${b^2} - {c^2}$
  • C
    ${c^2} - {a^2}$
  • D
    ${a^2} + {b^2} + {c^2}$

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