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Urbanisation and re-urbanisation both refer to the net movement of people into urban areas; in this sense, they are similar. The key difference lies in the times at which this movement occurs. Urbanisatio...

In the mark scheme at English A level, there is often reference to 'form' (e.g. context, letters vs novels), 'structure' (the order in which ideas emerge in the passage) and 'language' (the use of specifi...

A nerve cell when at rest is negatively charged, this means that on the inside it is more negative than on the outside. The potential difference is around -70mV. The mechanism that helps to achieve that p...

Both the cosine and sine rule are used to find either a missing side length or angle of a triangle that doesn't have a right angle. The cosine rule is used when you know the length of two sides and the an...

sin2x = 2sinxcosxcos2x = cos²x - sin²x=2 cos²x - 1= 1 - 2sin²xtan2x = (2tanx)/(1-tan²x)