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First we have to identify that implicit differentiation is used to solve this question. We can differentiate the first the LHS first, by using the chain rule, we know that the differentiation of e^(xy) is...

In most cases, an essay question is asking you to debate a certain topic. For example, if you were to study Doctor Faustus, a question-title may be "Does Marlowe present Faustus as a character with w...

Fermat's Principle states that light will always take the path of least travel TIME (NOT DISTANCE), at a first glance it appears that the path of least time would be a straight line from A to B, but this ...

A key part of A-level English Literature is understanding the context of texts. We should note that when we are reading something, what we are reading is very often inseparable from a network of ideas and...

I think there are two key points to this answer. Firstly, that though a question may just say 'discuss character X', what its really asking is 'how does character X develop' - its very rare to find a tota...