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During the exam, the essay titles are out of your hands so all you can do is pick the essay that suits you and your knowledge best and go from there. Some people can be tempted to only learn one book in d...

I am very sympathetic because oral exams are my least favourite part of my subject, even at degree level, and honestly the best thing to do is practise! Try talking to yourself in your head in French, try...

The chain rule is used to differentiate composite functions, ie "a function of a function". In this case we have an outer function and an inner function. For example

Differentia...

cos(AOB) = a.b/(|a| x |b|)

a.b = (6i - j + 3k).(-4i + 2j + 10k)

      = (6 x -4...

The myelin sheath is a layer of insulating, fatty material that encases some neurones. The sheath is composed of Schwann cells that have gaps called nodes of Ranvier between them. Potassium and sodium ...