Applications of Differentiation (AQA A-Level Mathematics): Flashcards

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Second Order Derivatives
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Definition of second order derivative

Derivative of the first derivative of a function

Notation for second derivative

f(x)f''(x) or rac{d^2y}{dx^2}

What second derivative represents

Rate of change of gradient

Condition for concave up graph

f(x)>0f''(x) > 0

Condition for concave down graph

f(x)<0f''(x) < 0

Definition of inflection point

Point where concavity changes

When do inflection points occur

Where second derivative changes sign

If f(x)>0f''(x) > 0 at critical point

Local minimum

If f(x)<0f''(x) < 0 at critical point

Local maximum

In physics, 2nd derivative of position gives

Acceleration

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