यदि $y = \sin ax + \cos bx$ है, तो $y'' + b^2 y =$

  • A
    $(b^2 - a^2) \sin ax$
  • B
    $(b^2 - a^2) \cos bx$
  • C
    $(a^2 - b^2) \tan ax$
  • D
    $(b^2 - a^2) \cot bx$

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