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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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3.7 HYPERBOLIC FUNCTIONS43cosh x21sech x−2 −11 2xFigure 3.11Graphs of cosh x <strong>and</strong> sechx.4cosech x2sinh x−2 −11 2x−2cosech x−4Figure 3.12Graphs of sinh x <strong>and</strong> cosechx.Hence, by the definitions given in the previous subsection,cosh x =cosix, (3.44)i sinh x =sinix, (3.45)cos x =coshix, (3.46)i sin x = sinh ix. (3.47)These useful equations make the relationship between hyperbolic <strong>and</strong> trigono-103

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