Find the equations of tangent and nor...

Find the equations of tangent and normal to the ellipse `(x^2)/(a^2)+(y^2)/(b^2)=1` at `(x_1,\ y_1)` .

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The correct Answer is:

`(a^(2)x)/x^(1) - (b^(2)y)/y^(1) = a^(2) - b^(2)`

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