The equation of the normal to the ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$ at the point $(a \cos \theta, b \sin \theta)$ is

  • A
    $\frac{ax}{\sin \theta} - \frac{by}{\cos \theta} = a^2 - b^2$
  • B
    $\frac{ax}{\sin \theta} - \frac{by}{\cos \theta} = a^2 + b^2$
  • C
    $\frac{ax}{\cos \theta} - \frac{by}{\sin \theta} = a^2 - b^2$
  • D
    $\frac{ax}{\cos \theta} - \frac{by}{\sin \theta} = a^2 + b^2$

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The correct option is:

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