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Question 3 on the OCR MEI C3 June 2015 paper. Find the exact value of Integral x^3 ln x dx between 1 and 2.

This is a good candidate for integration by parts because it is a product of two functions – ln(x) and x^3, and x^3 is easy to integrate. The definition for integration by parts is: integral(u dv/dx) dx = uv...
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Answered by Tom K. • Maths tutor
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Describe how restriction enzymes are used to cut out DNA fragments

Restriction enzymes cut at specific sequences named palindromic sequences. These are unique as they read the same in opposite directions. A specific palindromic sequence is complementary to a specific restri...
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Answered by Abigail C. • Biology tutor
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What is the best way to evaluate a historical source?

There are a number of ways to evaluate a source, and by using a range of these you can get an excellent idea of whether it is reliable or not. When was it written?- Often public opinion on certain people or ...
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Answered by Sophie D. • History tutor
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What is the best way to approach the analysis of language in poetry?

The best way to start with this kind of analysis, particularly with unseen poetry is to read through the poem carefully and get a general feel for how it makes YOU feel. Does it make you feel happy or sad? W...
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What are some key evaluation points of biological explanations of schizophrenia?

It is important to have balance in your evaluation, so don't just focus exclusively on negative evaluation points, try and include a range of points. For example, one major positive evaluation point for biol...
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Answered by Sophie D. • Psychology tutor
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