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trigonometric functions |
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trigonometric functions [¦trig·ə·nə¦me·trik ′fəŋk·shənz] (mathematics) The real-valued functions such as sin(x), tan(x), and cos(x) obtained from studying certain ratios of the sides of a right triangle. Also known as circular functions. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A zij may contain up to 200 pages of text and eight different kinds of tables (such as tables for calendar conversion, trigonometric functions, stellar coordinates, geographical longitudes and latitudes); this is why "only the hardy would get involved with a zij"; King is certainly one of them, as his "zijing days" in Cairo amply testify. Advanced methods often employ complex mathematical functions-such as logarithms, exponentiation, trigonometric functions and sophisticated statistical functions-to obtain the predictive characteristics desired. From 1938 to 1946, 37 volumes of the NBS Math Tables Series were issued, containing tables of trigonometric functions, the exponential function, natural logarithms, probability functions, and related interpolation formulae (23). |
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