If the sum of the slopes of the lines represented by the equation $x^2 - 2xy \tan A - y^2 = 0$ is $4$,then $\angle A = $

  • A
    $0^o$
  • B
    $45^o$
  • C
    $60^o$
  • D
    $\tan^{-1}(-2)$

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