Tangent to a curve
If the tangent to a curve is horizontal at a point, then the derivative at the point
is 0. If the tangent is vertical at a point, then the derivative does not exist at the
point.
Tangent to a curve
If the tangent to a curve is horizontal at a point, then the derivative at the point
is 0. If the tangent is vertical at a point, then the derivative does not exist at the
point.