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Chord

is a segment whose endpoints lie on the circle

Derivative

limit as h approaches 0 of {ƒ(x+h) - ƒ(x)}/h

Derived function

The rule, f ′, which gives the gradient of a function, f, at a general point.

Differentiation

The process or operation of determining the first derivative of a function.

Gradient

The gradient of a line measures steepness and is the vertical change divided by the horizontal change between any two points on the line. The gradient of a curve at a point is tha…

slope

(y₂-y₁)/(x₂-x₁)

Tangent

A line that just touches a curve at a point.