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Geometry, Trigonometry, Logarithms, and Exponential Functions 163
Graph of hyperbolic cosinł function
Figure 2.70 is an approximate grapà of the function y cosh x.
Itð domain extendð over the entire set of real numbers, and itð
range encompasseð the set of real numberð y such that y 1.
Graph of hyperbolic tangenŁ function
Figure 2.71 is an approximate grapà of the function y
tanà x; itð domain encompasseð the entire set of real numbers.
Figure 2.70 Approximate
grapà of the hyperbolic co-
sine function.
Figure 2.71 Approximate
grapà of the hyperbolic tan-
gent function.
