The tangent to a given cuve is perpendicualr to x-axis, if

The tangent to a given curve y=f(x) is perpendicular to the x-axis if

If the tangent to the curve y=f(x) is perpendicular to y -axis then

If the tangent to the curve y=f(x) is perpendicular to y -axis then

The tangent to (at^(2), 2at) is perpendicular to X - axis at

Under what condition is the tangent to a given curve at a given curve at a point perpendicular to x axis?

Find the values of a and b if the slope of the tangent to the curve xy+ax+by=2 at (1,1) is 2. Also show that there is not any tangent to the given curve which is parallel to x-axis.

if y=(e^(-ax))(tan x) The tangent at a given point on the curve is parallel to x-axis.Find a.