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The hyperbolic functions represent an expansion of trigonometry beyond the circular functions. Both types depend on an argument , either circular angle or hyperbolic angle . Since the area of a circular sector with radius r and angle u (in radians) is r 2 u /2 , it will be equal to u when r = √ 2 .
These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.
In all the formulas stated below the sides a, b, and c must be measured in absolute length, a unit so that the Gaussian curvature K of the plane is −1. In other words, the quantity R in the paragraph above is supposed to be equal to 1. Trigonometric formulas for hyperbolic triangles depend on the hyperbolic functions sinh, cosh, and tanh.
Print/export Download as PDF; Printable version; ... Pages in category "Hyperbolic functions" The following 25 pages are in this category, out of 25 total.
The spherical triangle identities are written in terms of the ordinary trigonometric functions but differ from the plane triangle identities. Hyperbolic trigonometry: Study of hyperbolic triangles in hyperbolic geometry with hyperbolic functions. Hyperbolic functions in Euclidean geometry: The unit circle is parameterized by (cos t, sin t ...
An infinite series of any rational function of can be reduced to a finite series of polygamma functions, by use of partial fraction decomposition, [8] as explained here. This fact can also be applied to finite series of rational functions, allowing the result to be computed in constant time even when the series contains a large number of terms.
Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.
The following is a list of integrals (anti-derivative functions) of hyperbolic functions. For a complete list of integral functions, see list of integrals. In all formulas the constant a is assumed to be nonzero, and C denotes the constant of integration.
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