Trigonometric functions Excel

Excel s mathematical and trigonometric functions (50 of them in Excel 2000) include functions that correspond to the following "scientific calculator" functions ... 

The spatial domain for problems normally encountered in chemical engineering are usually composed of rectangular, cylindrical, or spherical coordinates. Linear problems having these types of domain usually result in ODEs (after the application of separation of variables) that are solvable. Solutions of these ODEs normally take the form of trigonometric, hyperbolic, Bessel, and so forth. Among special functions, these three are familiar to engineers because they arise so frequently. They are widely tabulated in handbooks, for example, the handbook by Abramowitz and Stegun (1964) provides an excellent resource on the properties of special functions. 

Figure 2.10 shows the hyperbolic sine and hyperbolic cosine for values of x from 0 to 3. Note that the values of the hyperbolic sin and the hyperbolic cosine do not necessarily lie between -1 and 1 as do the values of the circular sine and cosine functions and that both functions approach e /2 for large values of x. The hyperbolic trigonometric functions are available in Excel. 

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