High school or college students taking an introductory trigonometry course may find this site useful. Three modules comprise the site, and each provides an overview of basic concepts. Some of the most common trigonometric identities are explained and illustrated in example problems. Each module is accompanied by an interactive set of problems that test the user's understanding of the concepts. Many other online math activities are available on the Syvum Web site. Some popup advertisements are included in the site, but they do not significantly detract from its quality.
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