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I'm not sure how this relates to To Kill a Mockingbird, because I don't remember anyone studying trigonometry in the novel. Trigonometry is the study of triangles and angles. There are some useful formulas on this web site here. http://en.wikipedia.org/wiki/Trigonometry#Common_formulas Which one you use depends on your problem, of course!
I don't think this is in the right topic. No-one ever talks about trigonometry in "To Kill A Mockingbird". Try the Math section. :D
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