The centre of an ellipse is $C$,$PN$ is any ordinate,and $A$,$A'$ are the end points of the major axis. Then the value of $\frac{PN^2}{AN \cdot A'N}$ is

  • A
    $\frac{b^2}{a^2}$
  • B
    $\frac{a^2}{b^2}$
  • C
    $a^2 + b^2$
  • D
    $1$

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