यदि $u = u(x, y) = \sin(y + ax) - (y + ax)^2$ है, तो निम्नलिखित में से कौन सा सत्य है?

  • A
    $u_{xx} = a^2 u_{yy}$
  • B
    $u_{yy} = a^2 u_{xx}$
  • C
    $u_{xx} = -a^2 u_{yy}$
  • D
    $u_{yy} = -a^2 u_{xx}$

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