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Write the value of (dy)/(dx) , if the no...

Write the value of `(dy)/(dx)` , if the normal to the curve `y=f(x)` at `(x ,\ y)` is parallel to y-axis.

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The slope of the
`y`-axis is `\infty.`
Also, the normal at `(x, y)` on the curve `y=f(x)` is parallel to the `y`-axis.
...
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