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This problem calls for you to describe and explain the features of the graphs and symmetry arguments will be very useful. First think about the features of the graphs and try to sketch them for yourself, then it may help to use a graphic calculator or graphing software.






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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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