In mathematics, a hyperbolic function is similar to a common (also called a circular function) trigonometric function. The basic hyperbolic function is the hyperbolic sine "sinh" and the hyperbolic cosine "cosh", similar to the derivation of trigonometric functions.
Hyperbolic cosine: \(coshx = [ e^x + e^{-x} ] / 2\) ,x∈R
y=cosh x, domain: R, value range: [1, +∞), even function, function image is catenary, the lowest point is (0,1), strictly monotonically increasing curve in I quadrant, the image is symmetric about the y-axis, ie the function cosh x is an even function symmetric about the y-axis.
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