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The Tangent Ratio Links
For a comprehensive history of the trigonometric functions visit www-history.mcs.st-and.ac.uk/history/HistTopics/Trigonometric_functions.html The Math Forum runs a trigonometry and calculus problem of the week at http://mathforum.org/calcpow/ The emphasis is on providing challenging and non-routine problems and there is an archive of past problems and solutions. Try searching tangent to get a host of interesting problems. The trigonometry section at www.mathstutor.com/MenuFrame.html has worked trigonometry examples and practice questions that can be completed online.
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