EXPLORING CONCEPTS
Hyperbolic Functions Use the graphs on page 391 to determine whether each hyperbolic function is even, odd, or neither.
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Even and Odd Functions Determine whether the function f is even odd, or neither. If f is even or odd, use symmetry to sketch its graph.
The hyperbolic cosine function is defined by
(a) Sketch the graphs of the functions and on the same axes, and use graphical addition to sketch the graph of
(b) Use the definition to show that
Determine whether the given function is odd, even, or neither odd nor even.