As well as exam questions where integration forms the main content, it is also used as a technique as part of many other questions, so it's really worth spending time getting your head around different types of integration question and improving your fluency at spotting how to solve integrals.
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Integration
This short article offers some advice for tackling STEP and other advanced mathematics examinations questions on integration
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By sketching a graph of a continuous increasing function, can you prove a useful result about integrals?
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Prepare for university - pure mathematics
Helpful preparation for those intending to study a course involving pure mathematics at university.
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Prepare for university - applied mathematics
Helpful preparation for university for those intending to study a
course involving applied mathematics at university.
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NRICH and Olympiads
A useful entry point into the NRICH site for those students interested in Mathematical Olympiad problems or the Maths Challenges.