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The imperfect is used for:

- description in the past (eg the door was red - la porte était rouge)

- things that you used to do many times i...

These are all properties of waves and their definitions are useful to remember for exams. It can also be helpful to draw diagrams of each to help you to remember the difference. On the diagram it is us...

Firstly, to expand an equation like this, you must multiply the brackets by the number outside of the brackets. Make sure that you multiply every number inside the bracket by the number directly outsid...

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...