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Wartime Farm: ChristmasSunday, 29th March 2015 08:00 - YesterdayIt's Christmas, and our living historians are back in the war, and back on the land, for a very special Wartime Farm. Read more: OU on the BBC: Wartime Farm - Christmas Special
Timewatch: StonehengeSunday, 29th March 2015 22:05 - BBC Four
Thinking Allowed: Global clothing and poverty, fur inheritance in PolandMonday, 30th March 2015 00:15 - BBC Radio 4
A History of Ideas - How do I live a good life?Monday, 30th March 2015 12:04 - BBC Radio 4
The Bottom Line - Corporate scandalAvailable until Saturday, 26th March 2016 14:15How do companies recover from negative press? Evan Davis hears from guests who have broken away from scandal on this... Read more: The Bottom Line - Corporate scandal
Turn your bank holiday into a badged holidayWhat are your plans for the long weekend? DIY? A trip to a windswept beach? Why not take your... Read more: Turn your bank holiday into a badged holiday
Take the photographic memory testCan you capture scenes just by looking at them? Find out with our photographic memory test. Launch now: Take the photographic memory test
Early years team work and leadershipThis unit explores aspects of teamwork and leadership for early years practitioners. Try: Early years team work and leadership now
Succeed with maths – Part 1[BETA] If you feel that maths is a mystery that you want to unravel then this short 8-week course... Try: Succeed with maths – Part 1 now
Real functions and graphs
Sometimes the best way to understand a set of data is to sketch a simple graph. This...
Sometimes the best way to understand a set of data is to sketch a simple graph. This exercise can reveal hidden trends and meanings not clear from just looking at the numbers. In this unit you will review the various approaches to sketching graphs and learn some more advanced techniques.
By the end of this section you should be able to:
- understand the definition of a real function;
- use the notation for intervals of the real line;
- recognise and use the graphs of the basic functions described in the audio section;
- understand the effect on a graph of translations, scalings, rotations and reflections;
- understand how the shape of a graph of a function features properties of the function such as increasing, decreasing, even and odd.
- determine the x-intercepts and y-intercept of a given function f;
- determine the intervals on which a given function f is positive or negative;
- determine the intervals on which a given function f is increasing or decreasing, and any points at which f has a local maximum or local minimum;
- describe the asymptotic behaviour (if any) of a given function f;
- sketch the graph of a given function.
- sketch the graph of a combination of two functions, one of which is a trigonometric function;
- sketch the graph of a hybrid function, whose rule is defined by different formulas on different parts of its domain.
- define the hyperbolic functions cosh x, sinh x and tanh x, and be familiar with their properties;
- sketch the graphs of cosh x, sinh x and tanh x, and their reciprocals.
- plot a curve that is specified by a parametric representation;
- obtain the equation of a curve that is specified by a parametric representation, in simple cases;
- sketch a conic whose equation is given in standard form.
Real functions and graphs
Many problems are best studied by working with real functions, and the properties of real functions are often revealed most clearly by their graphs. Learning to sketch such graphs is therefore a useful skill, even though computer packages can now perform the task. Computers can plot many more points than can be plotted by hand, but simply ‘joining up the dots’ can sometimes give a misleading picture, so an understanding of how such graphs may be obtained remains important. The object of this unit is to review the various techniques for sketching graphs that you may have met in your previous studies, and to extend these methods.
This unit is an adapted extract from the Open University course