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    Further Mathematics GCSE

    Mixed Derivative Theorem (Clairaut's Theorem)

    What Mixed Derivative Theorem (Clairaut's Theorem) means in Further Mathematics GCSE, as defined for OCR.

    Definition of Mixed Derivative Theorem (Clairaut's Theorem)

    The principle that the mixed second partial derivatives are equal: $f_{xy} = f_{yx}$, provided the second partial derivatives are continuous.
    OCR · Additional Pure Mathematics (study guide)

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    Using Mixed Derivative Theorem (Clairaut's Theorem) in the exam

    Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.

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