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The first thing we need to think about to answer this question is the target of this income tax. During a short introduction it is useful to outline what the question is really asking so that you are a...

This question is really straight forward

By using the Chain rule: f'(x) = uv' + u'v.

let u=3x, so u'=3

let v=(2x-1)^2, so v'=2x2(2x-1)=8x-4

Now, ...

The key to this is remembering that introductions rarely score additional marks on exams, and so a short but sweet introduction is perfectly fine! 

The most important thing is to avoid ph...