# Category:Definitions/Tangents

This category contains definitions related to Tangents.
Related results can be found in Category:Tangents.

Let $f: \R \to \R$ be a real function.

Let the graph of $f$ be depicted on a Cartesian plane. Let $A = \tuple {x, \map f x}$ be a point on $G$.

The tangent to $f$ at $A$ is defined as:

$\ds \lim_{h \mathop \to 0} \frac {\map f {x + h} - \map f x} h$

Thus the tangent to $f$ at $x$ can be considered as the secant $AB$ to $G$ where:

$B = \tuple {x + h, \map f {x + h} }$

as $B$ gets closer and closer to $A$.

By taking $h$ smaller and smaller, the secant approaches more and more closely the tangent to $G$ at $A$.

Hence the tangent to $f$ is a straight line which intersects the graph of $f$ locally at a single point.

## Also see

Category:Definitions/Tangent Function

## Subcategories

This category has the following 2 subcategories, out of 2 total.

## Pages in category "Definitions/Tangents"

The following 7 pages are in this category, out of 7 total.