The slope of the normal to the cirlce x^...

The slope of the normal to the cirlce `x^(2)+y^(2)=a^(2)` at the point `(x_(1),y_(1))` is -

`(x_(1))/(y_(1))`

`-(x_(1))/(y_(1))`

`-(y_(1))/(x_(1))`

`(y_(1))/(x_(1))`

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