Hyperbolic functions - mathcentre.ac.uk
The hyperbolic functions coshx and sinhx are defined using the exponential function ex. We shall start with coshx. This is defined by the formula coshx = ex +e−x 2. We can use our knowledge of the graphs of ex and e−x to sketch the graph of coshx. First, let us calculate the value of cosh0. When x = 0, ex = 1 and e−x = 1. So
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